Thursday, 13 August 2026

On This Day in Math - August 14

  

It is the facts that matter, not the proofs. Physics can progress without the proofs, 

but we can't go on without the facts ... 
if the facts are right, then the proofs are a matter of playing around with the algebra correctly.

Richard Feynman: 

The 226th Day of the Year

The iteration of the sum of the squares of the digits leads to one (a happy number). What percentage of base ten numbers have this property? (see below)  
The origin of happy numbers is unclear. Reg Allenby (a British author and senior lecturer in pure mathematics at Leeds University) was introduced to them by his daughter, who had learned of them at school. However, according to Richard Guy, they "may have originated in Russia"

226 = 3!3+2!3+1!3 + 0!3 *Derek Orr

The binary expression for 226 has the same number of ones and zeros. There are only 49 such year days, and this is number 46.

226 is one more than a square, and one less than a prime.  (Numbers one more than a power, 226=15^2+1 for example, are called Cunningham numbers after English mathematician A. J. C. Cunningham (1842 - 1928).

226 =15^2 + 1^2. So what might you learn from seeing that written as (8+7)^2 + (8-7)^2?

226 has a totally balanced binary expression, with four ones and four zeros.

226 is the tenth centered pentagonal number.




About happy numbers:  It seems that the answer is surprisingly complex! Happy numbers don't have a well-defined density or percentage.  Justin Gilmer proved that the lower density of happy numbers is below 12 percent and the upper density is above 18 percent *Scientific American. 
This means that as you look at larger and larger ranges of numbers, the percentage of happy numbers oscillates between these bounds without converging to a single value.




EVENTS


733 "In this year Aethelbald captured Somerton; and the Sun was eclipsed, and all the Sun's disc was like a black shield; and Acca was driven from his bishopric." The Anglo Saxon Chronicle Refers to the annular solar eclipse of 14 August AD 733.*NSEC

The Eclipse of 2024bfrom Paducah, Ky




1003 al-Biruni observed two lunar eclipses from Gurgān,(Azerbaijan)  one on 19 February and the other on 14 August. On 4 June of the following year, 1004, he observed a third lunar eclipse.  *Encylopedia . com
A more recent eclipse photo from 2009





1612 Galileo explains his new method of observing the sun in his second letter to Marc Welser:
… I shall now describe the method of drawing the spots with complete accuracy. This was discovered, as I hinted in my other letter, by a pupil of mine, a monk of Cassino named Benedetto Castelli. …
The method is this: Direct the telescope upon the sun as if you were going to observe that body. Having focused and steadied it, expose a flat white sheet of paper about a foot from the concave lens; upon this will fall a circular image of the sun's disk, with all the spots that are on it arranged and disposed with exactly the same symmetry as in the sun. The more the paper is moved away from the tube, the larger this image will become, and the better the spots will be depicted. Thus they will be seen without damage to the eye, even the smallest of them — which, when observed through the telescope, can scarcely be perceived, and only with fatigue and injury to the eyes.”
Previously he had only observed the sun directly near sunrise or sunset. *Galileo's Sunspot Letters at sdsu.edu/



1659 In a letter from Fermat to Carcavi - Fermat claimed to be able to prove the following five theorems by the method of infinite descent:

(1) The area of a right-angled triangle whose sides are integers cannot be a square number.

(2) The equation x^3 + y^3 = z^3 has no solutions in integers.

(3) The equation y^2 + 2 = x^3 admits no solutions in integers except x = 3, y = 5. **see below

(4) The equation y^2 + 4 = x^3 admits no solutions in integers except x = 2, y = 2 and x = 5, y = 11.

(5) Each prime number of the form p = 4n + 1 is uniquely expressible as the sum of two squares.

He ends his letter to Carcavi as follows:-

Here you have a summary account of my dreams on the subject of numbers. I have only written it because I fear I will lack the leisure to fully express myself and to lay out the entirety of my demonstrations and methods; in any case, this outline will serve the savants to be able to prove for themselves that which I have not filled out, especially if MM de Carcavi and Frenicle give them some demonstrations by descent that I have sent them on the subject of some negative propositions. And perhaps posterity will be thankful for my having let them know that which the Ancients did not ... *SAU
 ** The right triangle theorem in number three is the only known complete proof of any of Fermat's "theorems". During his lifetime, Fermat challenged several other mathematicians to prove the non-existence of a Pythagorean triangle with square area, but did not publish the proof himself. However, he wrote a proof in his copy of Bachet's Diophantus, which his son discovered and published posthumously
.



1797 Caroline Herschel, having observed her eighth comet, took the extra measure of riding from Slough to Greenwich to notify Astronomer Royal Maskelyne . A nice article about this event is at The Guardian Web page.
"She reported that “with only the preparation of one hour’s sleep” after her night of observing, she had ridden nearly 30 miles – despite “having in the course of five years never rode above two miles at a time” – to reach the Royal Observatory in Greenwich and the Astronomer Royal. Maskelyne greeted the news with enthusiasm and urged her to call on Banks to tell him personally."
 She moved from Germany to England in 1772 to join William in Bath, where she initially helped him with his musical career. However, she soon became involved in his astronomical work, assisting with telescope construction and observations.  Caroline had originally gone to England to pursue a career as a singer, but William's growing passion for astronomy gradually drew her into the field as well. She became not just an assistant but an accomplished astronomer in her own right, eventually discovering several comets and becoming the first woman to receive a salary for scientific work in England.




1894 “The first summer meeting of the American Mathematical Society was held in one of the lecture-rooms of the Polytechnic Institute in Brooklyn, N.Y.” Only ten papers were presented! The meeting lasted two days; August 15 was the second. *VFR
This was on a Tuesday and Wednesday of the week to immediately precede the dates of the meeting of The American Association for the Advancement of Science. Thomas Friske's papers indicate this was not only the first summer meeting, it was the first meeting ever under the AMS name. The New York Association had dissolved and reformed itself into the AMS.
The following papers were presented :
1. Theorems in the calculus of enlargement. Dr. Emory
McOlintock, New York, N. Y.
2. A method for calculating simultaneously all the roots of
an equation. Dr. Emory McOlintock, New York, N. Y.
3. Elliptic functions and the Cartesian curve. Professor
Frank Morley, Haverford, Pa.
4. Concerning the definition by a system of functional
properties of the function f\z) = sin 7tz . Professor E. Hastings
Moore, Chicago, 111.
5. Bertrand's paradox and the non-euclidean geometry»
Professor George Bruce Halsted, Austin, Texas.
6. Analytical theory of the errors of interpolated values
from numerical tables. Professor R. S. Woodward, New
York, N. Y.
7. Upon the problem of the minimum sum of the distances
of a point from given points. Professor V. Schlegel, Hagen,
Germany.
8. On the fundamental laws of algebra. Professor Alexander
Macfarlane, Austin, Texas.
9. About cube numbers whose sum is a cube number. Dr.
Artemas Martin, Washington, D.O.
10. Reduction of the resultant of a binary quadric and w-ic
by virtue of its semicombinant property. Professor Henry S.
White, Evanston, 111.
In the absence of their authors, paper No. 7 was presented
by Professor Hyde, paper No. 9 by the Secretary, and No. 10
by Professor Ziwet.
*Bulletin of the American Mathematical Society

 



In 1894, the first wireless transmission of information using Morse code was demonstrated by Oliver Lodge during a meeting of the British Association at Oxford. A message was transmitted about 150 yards (50-m) from the old Clarendon Laboratory to the University Museum. However, as he later wrote in his Work of Hertz and Some of his Successors, the idea did not occur to Lodge at the time that this might be developed into long-distance telegraphy. "Stupidly enough, no attempt was made to apply any but the feeblest power, so as to test how far the disturbance could really be detected." Nevertheless this demonstration predated the work of Guglielmo Marconi, who began his experiments in 1896.*TIS

Lodge,  (12 June 1851 – 22 August 1940) was a British physicist and writer involved in the development of, and holder of key patents for, radio. He identified electromagnetic radiation independent of Hertz's proof and at his 1894 Royal Institution lectures.
 



The drawing which accompanied the article 

1901 
Gustave Albin Whitehead  claims that he flew a powered machine successfully several times in 1901 and 1902, predating the first flights by the Wright Brothers in 1903.
Much of Whitehead's reputation rests on a newspaper article which was written as an eyewitness report and describes his powered and sustained flight in Connecticut on 14 August 1901.  *Wik 

The historical consensus strongly rejects Gustave Whitehead's claims. The Royal Aeronautical Society and Scientific American both conclude that "All available evidence fails to support the claim that Gustave Whitehead made sustained, powered, controlled flights predating those of the Wright brothers."


1912  Why didn't someone warn us sooner??? A newspaper clipping from 1912 that anticipates the global warming potential of burning coal is authentic and consistent with the history of climate science.  

@rainmaker1973



1940 John Atanasoff finishes a paper describing the Atanasoff Berry Computer, or ABC, the computer he designed with Clifford Berry to solve simultaneous linear equations. Atanasoff was only able to claim credit for this paper and title of inventor of the electronic digital computer after a long court battle that ended in 1972. The case - initiated on a charge by Honeywell Inc. that Sperry Rand​. Corp. had enforced a fraudulent patent - involved lengthy testimony by Atanasoff and ENIAC inventors Presper Eckert​ and John Mauchly​, who held the patent under review. A judge's ruling that Atanasoff was the true inventor led to invalidation of the ENIAC patent.
A working replica of the original ABC was completed in 1997 by staff and volunteers at Iowa State University at Ames. *CHM
The Atanasoff–Berry computer was the first automatic electronic digital computer. Limited by the technology of the day, and execution, the device has remained somewhat obscure. The ABC's priority is debated among historians of computer technology, because it was neither programmable, nor Turing-complete. 






2004 The US Postal Service announced the issue of a stamp honoring 1965 Nobel Laureate Richard Feynman. The day of the announcement was the independence day of Tannu Tuva, and it wasn’t a coincidence. Feynman and his friend and drumming partner Ralph Leighton had spent years trying to visit this small central Asian country near Mongolia. 







2012 A bit after 2:29 pm EDT, the U. S. Census Bureau said that the United States reached 314,159,265 residents.
Notice this is approximately pi * 100,000,000 .
*Hat tip to Tyler Clark, AMS Graduate Student Blog

"Make room for one more!!!"







BIRTHS

1530 Giovanni Battista Benedetti (14 August, 1530 - 20 June 1598) He was taught only by his father, by Tartaglia, and as he says in his writing, "N Tartaglia taught me only the first four books of Euclid, all the rest I learned by myself with great care and study. Nothing is difficult to him who would be learned." (A poster for every teachers wall). He demonstrated the classic constructions using only a "broken compass"; a compass of a fixed opening. Interestingly this was a challenge problem from Tartaglia to Cardan and Ferrari. Benedetti had a very low opinion of Tartaglia, perhaps because he had been his student during the loss of face duel with Ferrarri in which he left before the problems were finished. He also wrote before Galileo on the mechanics of free-fall.




1645 Siguenza y Gongora (August 14, 1645 – August 22, 1700) was a Mexican astronomer and philosopher.*SAU was one of the first great intellectuals born in the Spanish viceroyalty of New Spain. A polymath and writer, he held many colonial government and academic positions. In 1691, he prepared the first-ever map of all of New Spain. He also drew hydrologic maps of the Valley of Mexico. In 1692 King Charles II named him official geographer for the colony. As royal geographer, he participated in the 1692 expedition to Pensacola Bay, Florida under command of Andrés de Pez, to seek out defensible frontiers against French encroachment. He mapped Pensacola Bay and the mouth of the Mississippi: in 1693*Wik



1737 Charles Hutton (14 August 1737 – 27 January 1823) was an English mathematician who wrote arithmetic textbooks. A textbook he wrote while at the Royal Military Academy, Woolwich was later adopted as the first math text by the USMA in West Point, NY an d served as the principal math text for two decades. Hutton was working in the coal mines near Newcastle.  From there he rose to be influential in English mathematics and history.  His Mathematical and Philosophical Dictionary created the confusion in the meanings of trapezoid and trapezium . 
"However, in 1795 a Mathematical and Philosophical Dictionary by Charles Hutton (1737-1823) appeared with the definitions of the two terms reversed: Trapezium...a plane figure contained under four right lines, of which both the opposite pairs are not parallel. When this figure has two of its sides parallel to each other, it is sometimes called a trapezoid. No previous use of the words with Hutton's definitions is known. Nevertheless, the newer meanings of the two words now prevail in U. S. but not necessarily in Great Britain (OED2)."



1777 Hans Christian Oersted (14 Aug 1777, 9 Mar 1851 at age 73) Danish physicist and chemist whose discovery (1820) that an electric current in a wire causes a nearby magnetized compass needle to deflect, indicating the electric current in a wire induces a magnetic field around it, marks the starting point for the development of electromagnetic theory. For this, he can be called “the father of electromagnetism,” for which his name was adopted for the magnetic field strength in the CGS system of units (for which the SI system now uses the henry unit). Philosophically, he had believed nature's forces had a common origin. Oersted was the first to isolate aluminum as a metal (1825). He also made the first accurate determination of the compressibility of water (1822). Late in his career, he researched diamagnetism. In his final years, he turned back to philosophy, and started writing The Soul in Nature. *TIS



1842 Jean-Gaston Darboux, born (August 14, 1842, Nîmes – February 23, 1917, Paris) . French mathematician whose work on partial differential equations introduced a new method of integration (the Darboux integral) and contributed to infinitesimal geometry. He wrote a paper in 1870 on differential equations of the second order in which he presented the Darboux integral. In 1873, Darboux wrote a paper on cyclides and between 1887-96 he produced four volumes on infinitesimal geometry, including a discussion of one surface rolling on another surface. In particular he studied the geometrical configuration generated by points and lines which are fixed on the rolling surface. He also studied the problem of finding the shortest path between two points on a surface. *TIS
Among his students were Émile Borel, Élie Cartan, Édouard Goursat, Émile Picard, Gheorghe Țițeica and Stanisław Zaremba.
By 1911, Marie Curie was already world-famous — the first woman to win a Nobel Prize (1903, in Physics) and about to win her second (1911, in Chemistry). She sought election to the Académie des Sciences, an institution that had never before admitted a woman.

Her candidacy was championed by several scientists who recognized her groundbreaking work, but it faced fierce opposition from more traditional members, who argued that a woman should not enter the Academy. The debate became public and was tangled up with sexist attitudes, anti-Polish and even anti-Semitic press campaigns (partly fueled by the simultaneous scandal over her affair with Paul Langevin).
Gaston Darboux, who by then was a highly respected elder statesman of French mathematics and the permanent secretary of the Académie des Sciences, spoke and voted in favor of Marie Curie.

As secretary, Darboux had a measure of influence over how candidates were presented and how the vote was framed. He defended the scientific merit of her candidacy, emphasizing that Curie’s research on radioactivity was of historic significance and that the Academy’s decision should rest solely on scientific contributions, not gender or nationality.

Unfortunately, despite Darboux’s support and that of others like Paul Appell, Henri Poincaré (who died before the actual vote but had supported her), and Emile Borel, Curie lost the 1911 election by just two votes to Édouard Branly, an older and more conservative physicist known for his work on radio waves.

Gaston Darboux’s support didn’t succeed in getting Curie elected, but it set a precedent for a gradual change in attitudes. The French Academy did not elect a woman until 1962 — more than half a century later — but Darboux’s principled stance is remembered as one of the early signs of resistance to that exclusionary tradition. *PB




1850 Walter William Rouse Ball born in London. (14 August 1850 – 4 April 1925) a British mathematician, lawyer and a fellow at Trinity College, Cambridge from 1878 to 1905. He was also a keen amateur magician, and the founding president of the Cambridge Pentacle Club in 1919, one of the world's oldest such societies.*Wik Rouse Ball wrote A short account of the history of mathematics (1888) which provided a very readable and popular account of the subject. The fourth edition of 1908 was reprinted in 1960. He was also the author of the very popular Mathematical Recreations and Essays first published in 1892 which has run to fourteen editions (the last four being revised by H S M Coxeter).*SAU




1865 Guido Castelnuovo, (14 August 1865 – 27 April 1952) Italian algebraic geometer born. When Jewish students were barred from the state universities in the 1930’s, Castelnuovo organized courses for them. *VFR His father, Enrico Castelnuovo, was a novelist and campaigner for the unification of Italy. Castelnuovo is best known for his contributions to the field of algebraic geometry, though his contributions to the study of statistics and probability are also significant.*Wik He studied under Veronese and followed Cremona as the Advanced Geometry teacher in Rome.



1866 Charles-Jean Étienne Gustave Nicolas de la Vallée Poussin (14 August 1866 - 2 March 1962) was a Belgian mathematician. He is most well known for proving the Prime number theorem. This states that π(x), the number of primes ≤ x, tends to x/Ln(x) as x tends to infinity. (actually by this time the method of attack involved the use of Li(n), the logarithmic integral as described by Gauss).
The prime number theorem had been conjectured in the 18th century, but in 1896 two mathematicians independently proved the result, namely Hadamard (whose proof was much simpler) and Vallée Poussin. The first major contribution to proving the result was made by Chebyshev in 1848, then the proof was outlined by Riemann in 1851. The clue to two independent proofs being produced at the same time is that the necessary tools in complex analysis had not been developed until that time. In fact the solution of this major open problem was one of the major motivations for the development of complex analysis during the period from 1851 to 1896.
The king of Belgium ennobled him with the title of baron. *SAU



1867 Charles Albert Noble (August 14, 1867–May 7,1962) was an American mathematician, professor at the University of California, Berkeley.  Noble was a son of a farmer from the county of Santa Cruz, South of San Francisco Bay, but since he did not like agricultural work, he went to live with an older sister to San Francisco where he completed his secondary education. He enrolled at the University of California at Berkeley where he graduated in sciences in 1889. He then became a professor of mathematics at the Oakland High School. In 1893, wanting to obtain a doctorate in mathematics, he went to Europe to study at the Göttingen University with Felix Klein and David Hilbert. In 1896, he returned to San Francisco and he was appointed professor of mathematics at the University of California at Berkeley. In 1901, he defended his doctoral thesis at Göttingen, under the direction of Hilbert.

Noble was a fellow in mathematics, instructor, assistant professor, associate professor, professor, from 1896 to 1937, at Berkeley until his retirement in 1937. During the period 1933–34 he was the chairman of the mathematics department of the university and professor emeritus, 1937–1962.

Along with Earle Raymond Hedrick, another American doctorate in Göttingen, Noble published a translation into English of the book by Klein Elementary Mathematics from an advanced standpoint, in two volumes (1932 and 1939), that had a significant influence on the development of the American mathematical community.

Noble was also very interested in mathematics pedagogy and in 1926 he made a trip to Germany to investigate the teaching system of mathematics in schools. His work was published in 1927 in the journal of the Mathematical Association of America, The American Mathematical Monthly. He had been, in 1901, one of the founders of the San Francisco section of this association.





1886 Arthur Jeffrey Dempster (14 August, 1886 -11 Mar 1950)Canadian-American physicist who in 1918 built the first mass spectrometer (based on the invention of Francis W. Aston) and discovered isotope uranium-235 (1935). The mass spectrometer is an instrument that uses electric and magnetic fields to separate and measure a sample's atoms according to their mass and relative quantity. In 1935, he discovered that naturally occurring uranium, though mostly uranium-238, contained 0.7% U-235 (later used as the primary fuel in atomic bombs and reactors after Niels Bohr predicted it could be used to produce a chain reaction releasing huge amounts of nuclear fission energy). During WW II, Dempster worked with the secret Manhattan Project that developed the world's first nuclear weapons.*TIS



1888 Julio Rey Pastor (14 August 1888 – 21 February 1962) was a Spanish mathematician and historian of science. Rey proposed the creation of a "seminar in mathematics to arouse the research spirit of our school children.” His proposal was accepted and in 1915 the JAE created the Mathematics Laboratory and Seminar, an important institution for the development of research on this field in Spain.
In 1951, he was appointed director of the Instituto Jorge Juan de Matemáticas in the CSIC. His plans in Spain included two projects: the creation, within the CSIC, of an Institute of Applied Mathematics, and the foundation of a Seminar on the History of Science at the university. *Wik



1904 Léon Rosenfeld (14 August 1904 – 23 March 1974) was a Belgian physicist. He obtained a PhD at the University of Liège in 1926, and he was a collaborator of the physicist Niels Bohr. He did early work in quantum electrodynamics that predates by two decades the work by Dirac and Bergmann. He coined the name lepton. In 1949 Léon Rosenfeld was awarded the Francqui Prize for Exact Sciences. *Wik "The mind is able to build any constellation of concepts"



1906 Eugene Lukacs (14 August 1906 – 21 December 1987) was a Hungarian statistician born in Szombathely, notable for his work in characterization of distributions, stability theory, and being the author of Characteristic Functions, a classic textbook in the field.
In 1953 Eugene joined the Office of Naval Research (ONR) USA, and became the director of Statistics. While at ONR he also taught at American University in Washington, D.C.

Lukacs joined the Catholic University of America, Washington, D.C. in 1955. There he organized the Statistical Laboratory in 1959 and became its first and only director. Researchers at the Statistical Laboratory included Edward Batschlet, Tatsuo Kawata, Radha Laha, M. Masuyama and Vijay Rohatgi, and many distinguished visitors.
*Wik



1922 Sophie Willock Bryant (15 February 1850, Sandymount, Dublin, – 14 August 1922, Chamonix, France) was an Anglo-Irish mathematician, educator, feminist and activist. She was the first woman to receive a DSc in England; one of the first to serve on a Royal Commission and on the Senate of the University of London.
Bryant was born Sophie Willock in Dublin in 1850. Her father was Revd Dr William Willock DD, Fellow and Tutor of Trinity College, Dublin. She was educated at home, largely by her father. As a teenager she moved to London, when her father was appointed Professor of Geometry at the University of London in 1863, and she attended Bedford College. At the age of nineteen she married Dr William Hicks Bryant, a surgeon ten years older than she was, who died of cirrhosis within a year.
In 1875 Bryant became a teacher and was invited by Frances Mary Buss to join the staff of North London Collegiate School. In 1895 she succeeded Miss Buss as headmistress of North London Collegiate, serving until 1918.

When the University of London opened its degree courses to women in 1878, she started attending. In 1881, she became one of the first women to obtain a First Class Honours degree, in her case a BSc, in the first year that a British university awarded degrees to women. This was in Mental and Moral Sciences (Philosophy). She was awarded second class honours in mathematics. In 1884, she was awarded the degree of Doctor of Science in Mental and Moral Sciences. In 1882 she was the third woman to be elected to the London Mathematical Society, and was the first active female member, publishing her first paper with the Society in 1884. Together with Charles Smith, Bryant edited three volumes of Euclid's Elements of Geometry, for the use of schools (Euclid's Elements of Geometry, books I and II (1897); Euclid's Elements of Geometry, books III and IV (1899); Euclid's Elements of Geometry, books VI and IX (1901)).
While in London, she was a member of the London Ethical Society, an early humanist community which advocated moral living independent of religion. She was interested in Irish politics, wrote books on Irish history and ancient Irish law (Celtic Ireland (1889), The Genius of the Gael (1913)), and was an ardent Irish nationalist from a Protestant family background. She was president of the Irish National Literary Society in 1914. She supported women's suffrage but advocated postponement until women were better educated. She serve on consultative committees of the national Board of Education with other suffragists like Isabel Cleghorn.
Bryant loved physical activity and the outdoors. She rowed, cycled, and 
swam, and twice climbed the Matterhorn. She died in a hiking accident in the Alps in 1922, aged 72.



1933 Richard Robert Ernst (14 August 1933 – 4 June 2021) was a Swiss physical chemist and Nobel laureate.
Ernst was awarded the Nobel Prize in Chemistry in 1991 for his contributions towards the development of Fourier transform nuclear magnetic resonance (NMR) spectroscopy while at Varian Associates and ETH Zurich. These underpin applications to both to chemistry with NMR spectroscopy and to medicine with magnetic resonance imaging (MRI).

He humbly referred to himself as a "tool-maker" rather than a scientist. *Wik
As NMR spectroscopy developed into on of the most important instrumental measuring technique within chemistry, Ernst continued to improve both the sensitivity and the resolution of the instrument. NMR spectroscopy is now applied to determination of molecular structure in solution, to study interactions between different molecules (ex. enzyme/substrate, soap/water), to investigate molecular motion, to get information on the rate of chemical reactions and many other problems in chemistry, physics, biology and medicine.*TiS




1959 Peter Williston Shor (August 14, 1959; New York, NY - ) is an American professor of applied mathematics at MIT, most famous for his work on quantum computation, in particular for devising Shor's algorithm, a quantum algorithm for factoring exponentially faster than the best currently-known algorithm running on a classical computer.
While attending Tamalpais High School, in Mill Valley, California, he placed third in the 1977 USA Mathematical Olympiad. After graduating that year, he won a silver medal at the International Math Olympiad in Yugoslavia (the U.S. team achieved the most points per country that year). He received his B.S. in Mathematics in 1981 for undergraduate work at Caltech, and was a Fellow of William Lowell Putnam Mathematical Competition in 1978. He earned his Ph.D. in Applied Mathematics from MIT in 1985. His doctoral advisor was Tom Leighton, and his thesis was on probabilistic analysis of bin-packing algorithms.
After graduating, he spent one year in a post-doctoral position at the University of California at Berkeley, and then accepted a position at Bell Laboratories. It was there he developed Shor's algorithm, for which he was awarded the Rolf Nevanlinna Prize at the 23rd International Congress of Mathematicians in 1998. Shor always refers to Shor's Algorithm as "the Factoring Algorithm."
Shor began his MIT position in 2003. Currently the Henry Adams Morss and Henry Adams Morss, Jr. Professor of Applied Mathematics in the Department of Mathematics at MIT, he also is affiliated with CSAIL and the Center for Theoretical Physics (CTP).
He received a Distinguished Alumni Award from Caltech in 2007*Wik





DEATHS

1795 George Adams Jr. (1750– August 14, 1795), continued his father's work with his younger brother Dudley, publishing an Essay on Vision (1789) and Astronomical and Geometrical Essays (1789) and succeeding his father as Instrument Maker to King George II and the British East India Company. Born in Southampton he was later appointed Optician to the Prince of Wales. His instruments included barometers, microscopes, orreries, sectors, telescopes, and a variety of electrical appliances. He also made geographical globes.  Wik
*http://sciencemuseum.org.uk

1886 Edmond Nicolas Laguerre, (April 9, 1834, Bar-le-Duc – August 14, 1886, Bar-le-Duc) studied approximation methods and is best remembered for the special functions: the Laguerre polynomials.*SAU
He also investigated orthogonal polynomials (see Laguerre polynomials). Laguerre's method is a root-finding algorithm tailored to polynomials. He laid the foundations of a geometry of oriented spheres (Laguerre geometry and Laguerre plane), including the Laguerre transformation or transformation by reciprocal directions.*Wik 




1858 George Combe (21 Oct 1788- 14 Aug 1858) Scottish lawyer who turned to the promotion of phrenology and published several works on the subject. He followed Johann Spurzheim who coined the word "phrenology" and promoted it in Europe and Britain, elaborating on "cranioscopy" he learned from Franz Josef Gall in Paris. Gall was a French physician who identified a number of areas on the surface of the head that he linked with specific localizations of cerebral functions and the underlying attributes of the human personality. Combe established the first infant school in Edinburgh and gave evening
lectures. He studied the criminal classes and lunatic asylums wishing to reform them. Andrew Combe, physiologist, was his younger brother. *TIS phrenology was commonly accepted in the 19th and early 20th century. The device pictured here was used to measure the characteristics of the skull for phrenology. *CabinetOfCuriosities ‏@wunderkamercast

1930 Florian Cajori (28 Feb 1859 - 14 Aug 1930)Swiss-born U.S. educator and mathematician whose works on the history of mathematics were among the most eminent of his time.*TIS at times Cajori's work lacked the scholarship which one would expect of such an eminent scientist, we must not give too negative an impression of this important figure. He almost single-handedly created the history of mathematics as an academic subject in the United States and, particularly with his book on the history of mathematical notation, he is still one of the most quoted historians of mathematics today. *SAU




1958 Frederic Joliot-Curie (19 Mar 1900 - 14 August, 1958) French physical chemist, husband of Irène Joliot-Curie, who were jointly awarded the 1935 Nobel Prize for Chemistry for their discovery of artificially prepared, radioactive isotopes of new elements. They were the son-in-law and daughter of Nobel Prize winners Pierre and Marie Curie.*TIS



1967 Jovan Karamata (February 1, 1902–August 14, 1967) was one of the greatest Serbian mathematicians of the 20th century. He is remembered for contributions to analysis, in particular, the Tauberian theory and the theory of slowly varying functions. Karamata was one of the founders of the Mathematical Institute of the Serbian Academy of Sciences and Arts in 1946. *Wik





1987  Shigeo Sasaki  (18 November 1912 Yamagata Prefecture, Japan – 14 August 1987 Tokyo) was a Japanese mathematician working on differential geometry who introduced Sasaki manifolds. He retired from Tohoku University's Mathematical Institute in April 1976.*Wiki


,






Credits :
*CHM=Computer History Museum
*FFF=Kane, Famous First Facts
*NSEC= NASA Solar Eclipse Calendar
*RMAT= The Renaissance Mathematicus, Thony Christie
*SAU=St Andrews Univ. Math History
*TIA = Today in Astronomy
*TIS= Today in Science History
*VFR = V Frederick Rickey, USMA
*Wik = Wikipedia
*WM = Women of Mathematics, Grinstein & Campbell


Rheticus, and The Names of Trigonometric Ratios

   Spending lots of time lately reading old English journal articles (1825-45) sent me by Dave Renfro who tries to help me stay up on the history of math. It is kind of great reading and watching the actual history of ideas unfold as they did in the old journals.... I came across an interesting letter from Agustus De Morgan about the protege of Copernicus, George Joachim of Rhaetia, also called Rheticus. It was Rheticus who managed to convince Copernicus to publish his long withheld manuscript. In fact, the first account of the Copernican system was not published by Copernicus, but  in Rheticus’s Narratio prima in 1540.


I didn't realize for some years of teaching that in the very early days before the trigonometric functions, the early astronomers used the length of the chord of an angle.  The lost tables of Hipparchus (c. 190 BC – c. 120 BC) and Menelaus (c. 70–140 CE) and those of Ptolemy (c. AD 90 – c. 168) were all tables of chord


 lengths of central angles of a circle of specified radius.  The first step towards the common sine of an angle was by the fifth century Indian mathematician and astronomer Āryabhata, who chose to print tables of half-chords, or more specifically, a table of the first differences of the values of trigonometric sines expressed in arcminutes. were first thought conceived to be lengths of segments in a circle of a given diameter (or radius) rather than the more modern view of ratios. I did not know until I read this article, that apparently it was Rheticus who first developed the use of trig functions based on the ratios of sides of a triangle. In fact, the tables he created to include in his publication of the trigonometric sections of De Revolutionibus were the first tables to include all six functions and  (although he did not use the current names). 

" Rheticus published his first trigonometric canon, the Canon doctrinæ triangulorum, in 1551 in Leipzig . This table gave the six trigonometric functions at intervals of 10' of degree, semi-quadrantically arranged. Each function was given to 7 places, or more exactly as integers for a radius of 10^7.
Rheticus did not consider angles in circles, but considered triangles of which one of the side (the hypotenuse) was constant, and he gave the lengths of the other sides as a function of the angle at the center" *Denis Roegel

 This is a very rare table, and it was practically unknown when De Morgan happened to find a copy of it in the 1840s .

Here is the way De Morgan wrote it:
" Modern teachers (he writes in 1845) of trigonometry have pretty generally abandoned the system of independent lines, which used to be called sines, tangents, &c.; and have substituted, for the meaning of these words, the ratio of the sides of right-angled triangles. It appears that they have antiquity in their favor; indeed so completely has the idea of representing the ratios of the sides of triangles taken possession of the mind of Rheticus, that he abandons the use of the word sine. He dwells on the importance of the right-angled triangles, without any reference to the circle: his maxim expressed in the dialogue, is Triquetrum in planicie cum angulo recto, est magister Mathesos . It would also seem as if his choice of the semi-quadrantal arrangement with double descriptions was dictated merely by the convenience of heading one division with majus latus, and the other with minus latus. [Rheticus had labeled the top of his table with perpendiculum and basis, then the bottoms of these columns were reversed, much as Sine and Cosine were reversed at the top and bottom of tables used in my youth before calculators]........ The names cosine, cotangent, and cosecant are the consequence, not the cause, of this duplicate system of arrangements.......The introduction of the terms sine of the complement, complemental sine, and cosine, &c., followed after an interval of more than half a century."
De Morgan points out that one of the reasons it is so hard to find copies of much of Rheticus' work is that ", In the Index Expurgatorius, it is not Copernicus who is forbidden to be read generally; the prohibition only extends to the work De Revolutionibus, and is accompanied with a nisi corrigatur. But Rheticus is wholly forbidden to be read in any of his works. "
I think the difference in the two mens treatment in the Index may be because of the fact that Rheticus was Protestant, and in fact, was at Wittenburg, the very University where Luther had taught, and burned the Papal Bull.
(Another perhaps, was that Rheticus was more zealous about the Copernican system than Copernicus, insisting on the physical truth of the motion of the earth.

An interesting anecdote told about Rheticus while he was, "puzzling himself about the motion of Mars, he invoked his genius or guardian angel to help him out of the difficulty: the angel accordingly lifted him up by the hair of his head to the roof and threw him down upon the pavement saying with a bitter laugh, 'That's the way Mars moves.' "

addendum James asked about the phrase "semi-quadrantal"... this just means he only went from 0 degrees to 45 degrees (1/2 of a quadrant) and then put Sin-Cos (he didn't use these words) at the top of the columns and Cos-Sin in the reverse order at the bottom... so that from 45 to 90 degrees was simply read up from the bottom....My old CRC tables were arranged the same way, and many textbooks did as well in the Fifties-sixties. (See image below)
 Giving Sin and Cosine as ratios was still pretty new when this was written by De Morgan. It appears that Peacock had initiated the practice in his lectures at Cambridge around 1830, and by 1837, according to De Morgan, it had become the accepted way to define the terms.
Another newish feature of Rheticus' tables were the use of decimal fractions, introduce  by Regiomontanus (1436–76), German astronomer and mathematician, who composed the first tables with decimal fractions.

Some Notes About the Names from MacTutor at Saint Andrews University :
The Hindu word jya for the sine was adopted by the Arabs who called the sine jiba, a meaningless word with the same sound as jya. Now jiba became jaib in later Arab writings and this word does have a meaning, namely a 'fold'. When European authors translated the Arabic mathematical works into Latin they translated jaib into the word sinus meaning fold in Latin. In particular Fibonacci's use of the term sinus rectus arcus soon encouraged the universal use of sine.

Edmund Gunter was the first to use the abbreviation sin in 1624 in a drawing. The first use of sin in a book was in 1634 by the French mathematician Hérigone while Cavalieri used Si and Oughtred S.
It is perhaps surprising that the second most important trigonometrical function during the period we have discussed was the versed sine, a function now hardly used at all. The versine is related to the sine by the formula
versin =1cos.
It is just the sine turned (versed) through 90°.

The cosine follows a similar course of development in notation as the sine. Viète used the term sinus residuae for the cosine, Gunter (1620) suggested co-sinus. The notation Si.2 was used by Cavalieri, s co arc by Oughtred 

The tangent and cotangent came via a different route from the chord approach of the sine. These developed together and were not at first associated with angles. They became important for calculating heights from the length of the shadow that the object cast. The length of shadows was also of importance in the sundial. Thales used the lengths of shadows to calculate the heights of pyramids.

The first known tables of shadows were produced by the Arabs around 860 and used two measures translated into Latin as umbra recta (shadow erect) and umbra versa (shadow turned). Viète used the terms amsinus and prosinus. The name tangent was first used by Thomas Fincke in 1583 in his book Geometria rotundi, which is about plane and spherical trigonometry. The word comes from the Latin word tangens, which means "touching". . The term cotangens was first used by Edmund Gunter in 1620.

The common abbreviation used today is tan whereas the first occurrence of this abbreviation was used by Albert Girard in 1626, but tan was written over the angle.  \( Tan \choose {35^o}\). [By the way, the first known use of the degree symble as a raised o in the modern notation appears in print in the 1570s, with a borderline example by Jacques Pelletier du Mans in 1569, and was popularized by, among others, Tycho Brahe and Johannes Kepler, but didn't become universal.]
 
The secant and cosecant were not used by the early astronomers or surveyors. These came into their own when navigators around the 15th Century started to prepare tables. Copernicus knew of the secant which he called the hypotenusa.
The abbreviations used by various authors were similar to the trigonometric functions already discussed. Cavalieri used Se and Se.2, Oughtred used se arc and sec co arc while Wallis used s and σ. Albert Girard used sec, written above the angle as he did for the tan.

And just for the record, the term 'trigonometry' first appears as the title of a book Trigonometria by B Pitiscus, published in 1595.

On This Day in Math - August 13

 


It is clear that Economics, if it is to be a science at all,
must be a mathematical science.
~William Jevons


The 225th day of the year; 225 is the ONLY three digit square with all prime digits. Can you find a four digit square with all prime digits?

225 = 01+23+45+67+89  sequence differs by 22

225 = (3!)3+(2!)3+ (1!)3

\(225 = 1^3 + 2^3 + 3^3 + 4^3 + 5^3 \) (which means, of course, that \( 225 = (1+2+3+4+5)^2 \)


 225 is the last year day that is a sum of first n cubes. Called Nicomachus's theorem, after Nicomachus of Gerasa (c. 60 – c. 120 CE)

Nicomachus's theorem states that a square whose side length is a triangular number can be partitioned into squares and half-squares whose areas add to cubes.



225 is also the largest year day which is a square number that is the sum of three distinct positive cubes.  \(15^2= 1^3 + 2^3 + 6^3\)


See Math Facts for every Year Day here.




EVENTS


3114 BC The first day of the previous Mayan “long count” calendar (adjusted for the Gregorian Calendar). The long count calendar lasts 22,507,528 days and the previous calendar ended on December 21 of 2012. Many predicted the end of the world at that time (my current theory is that it did NOT end on that day). If the world did NOT end, we went back to year zero of the Mayan calendar.

For the Classic Maya, the beginning of the present creation was marked by this date, with each great cycle lasting 5,128 years and repeating indefinitely. *(The Maya Calendar Explained) This wasn't considered a historical date but rather a mythological starting point for the current world age - similar to how we mark years from the birth of Christ, though the Maya creation date predates recorded history by millennia.

Mayan time is marked in days (one day is called a kin), periods of 20 days (a uinal, or 20 kin), 360 days (a tun, or 18 uinal), 7,200 days (a katun, or 20 tun) and 144,000 days (a baktun, or 20 katun). December 21, 2012 marks the ending of the 13th baktun, which ends the Long Count cycle of 5,126 solar years.*aaas org 



1661 , Sir Robert Moray, senior courtier to Charles II, advises Wren that since he did not have time to construct microscope-based drawings that the king had requested, the task was passed to Hooke.  This assignment from the king would lead to Hooke's publication of Micrographia in 1665.  *Lisa Jardine, Ingenious Pursuits, pg 62



1672, Christiaan Huygens discovered the Martian south polar cap.*TIS He created the drawing at right, *Dept of History, Un Cal Irvine

Huygens was indeed a pioneering astronomer who made several important observations of Mars during the 17th century. His 1672 discovery of what appeared to be a bright polar region was one of the earliest telescopic observations of Martian surface features. This was quite remarkable given the limitations of telescopes available at that time.




1727 Charles-Etienne-Louis Camas elected to the French Academy of Sciences because he had earlier won half the prize money in their competition for the best manner of masting vessels. Did Euler get the other half? *VFR

The world first became aware of Euler's abilities when he published a paper about the "masting of ships". Euler submitted this paper as an entry in the French Academy of Science's annual contest. In competition not only with other graduate students but with many accomplished mathematicians and scientists, he was still able to win second prize. (Muir, p. 139) Presumably this paper discussed the physics and mathematics involved in the support of the mast, "a tall vertical spar that rises from the keel of a sailing vessel to support the sail and rigging."



1849 Gauss writes to his former student, Mobius, to thank him for sending a copy of Mobius' paper on third order curves and advises him to investigate the form of analytic curves from Gauss' 1799 dissertation. *Carl Friedrich Gauss: Titan of Science
By Guy Waldo Dunnington, Jeremy Gray, Fritz-Egbert Dohse

Although the geometry of the Mobius strip was found independently by German mathematicians Johann Benedict Listing and August Ferdinand Möbius in 1858, the curve existed in art back to antiquity.

These were probably not seen in the mathematical sense but more as coiled ribbons for decoration.

Mosaic from ancient Sentinum depicting Aion holding a Möbius strip


The Mobius strip was used as a way to reduce wear and "walking" of drive belts for powering machines as early as the 12th Century.


1849 George Boole writes to De Morgan to tell him he has received the math professorship at Queen's College Cork. In spite of stating clearly in his application, "I am not a member of any university and have never studied at a college." He had written numerous papers in the mathematical journals including one that won a Gold Medal from the Royal Society, and he included recommendations from some heavyweights of the period, Cayley, De Morgan, Kelland (professor at Edinburgh) and Charles Graves(professor of math at Trinity College Dublin).

Sir Edward Thomas ffrench Bromhead encouraged the young George Boole from Lincoln. Bromhead was President of the Lincoln Mechanics Institute in the Lincoln Greyfriars, where George Boole's father was the curator. Boole first came to public notice when he gave a lecture on the work of Sir Isaac Newton on 5 February 1835. The young Boole's development was fed by books that Bromhead supplied.  Bromhead had earlier been the patron of mathematician and physicist George Green, also of Lincoln. *Wik



1894 Sir William Ramsay and Lord Rayleigh announced the discovery of the first noble gas argon, named after the Greek word ‘argos’ (meaning ‘lazy’) because it was completely unreactive. For this work, Sir William Ramsey was awarded the Nobel Prize in Chemistry and Lord Rayleigh the Nobel Prize in Physics in 1904. *RSC.org

Ramsay and Rayleigh used two different methods to remove all known gases from air and discovered that argon made up almost 1% of the atmosphere. 

Ramsay's interest in argon began after he learned from American scientists that heating uranium minerals in sulfuric acid produced unidentified gases. He continued to experiment with similar methods, eventually discovering another new element, helium, while trying to isolate argon from cleveite. Helium had previously only been known in the solar spectrum. Based on the positions of argon and helium in the periodic table, Ramsay predicted the existence of other noble gases, including neon, krypton, and xenon. 




1898
 The first Near Earth Asteroid, 433 Eros was discovered by Carl Gustav Witt *David Dickinson @Astroguyz It was discovered on the same night by Witt in Berlin and Auguste Charlois at Nice. Eros was one of the first asteroids to be visited by a spacecraft, and the first to be orbited and soft-landed on. NASA spacecraft NEAR Shoemaker entered orbit around Eros in 2000, and came to rest on its surface in 2001. On January 31, 2012, Eros passed the Earth at 0.17867 AU (26,729,000 km; 16,608,000 mi), or about 70 times the distance to the Moon. *Wik


1903 The journal Nature reported that helium gas is produced by the radioactive decay of the radium. This key discovery by William Ramsay and Frederick Soddy helped to reveal the structure of atoms. In 1908, Rutherford confirmed that alpha rays and these radium emanations were one and the same: the nuclei of helium atoms, bearing a positive electrical charge. Each were future Nobel laureates in Chemistry. Ramsey won the Nobel Prize in 1904 for his discovery of the noble gases. Rutherford was recognized in 1908 for his investigations into the disintegration of the elements. Soddy was honored in 1921 for his pioneering contributions to understanding the chemical properties of radioactive elements such as radium and uranium.*TIS

*Soddy

On this day in 1952, Willie Mae “Big Mama” Thornton—the “biggest, baddest, saltiest chick” in blues music—recorded “Hound Dog.” (Yep, that Hound Dog True to her reputation, she gave the song everything she had—and changed rock and roll history.

“Hound Dog” had Willie Mae Thornton’s name on it from the get-go. And a ferocious performance with Johnny Otis’s band at Harlem’s Apollo Theater would soon earn her the nickname “Big Mama.”

Otis had an impeccable eye for talent (one of his other discoveries was R&B great Jackie Wilson). He asked Jerry Leiber and Mike Stoller, two teenage songwriters, to meet with Thornton. Leiber said, “We saw Big Mama and she knocked me cold.”

That first impression inspired them to write “Hound Dog,” a song about a woman who won’t put up with any more of her man’s cheating and mooching. Thornton didn’t just sing the lyrics, she screamed and growled them. “You ain’t nothin’ but a hound dog / quit snoopin’ ’round my door.” As if she knew exactly what kind of man those words were about.

In 2024 Big Mama Thornton was inducted into the Rock and Roll Hall of Fame.

“Hound Dog” was released in 1953 and spent seven weeks at the top of the Billboard R&B chart. Thornton became a star.(Here is a link to let you see how the song was meant to be sung>)

Another singer also found success with the song a few years later. You may have heard of him: Elvis Presley. His version, released in 1956, topped the pop, country, and R&B charts and launched the young rocker’s career straight into the stratosphere. (Thornton reportedly wasn’t thrilled about Presley’s success with the song, probably because she wasn’t given much credit for the original.)*Brittanica



1973  The Institute for Certification of Computing Professionals was founded. The bearer of the standards for the computer industry, ICCP promoted high professional standards for the computer industry and offered a certification program in which engineers earned the designations of Certified Computing Professional or Associate Computing Professional.





2014 At the opening ceremony of the International Congress of Mathematicians 2014 on August 13, 2014, the Fields Medals (started in 1936) were presented. Among the winners was Maryam Mirzakhani, the first female (and mother) ever to receive the award. (Sadly, she would die within three years of cancer.)
The three other winners were Artur Avila, Martin Hairer, and Manjul Bhargava.
You can read about them here . *Springer






BIRTHS


1625 Erasmus Bartholin (13 August 1625, Roskilde – 4 November 1698, Kopenhagen)..Bartholin was the editor of van Schooten's "Introduction to the geometry of Descartes", He also discovered double refraction of light using Icelandic Spar crystals. He worked with Ole Roamer in publishing some of Tycho Brahe's observations. His maternal grandfather was Thomas Fincke, the geometer who invented the terms tangent and secant. (*pb)




1704 Alexis Fontaine des Bertins, (13 August 1704 – 21 August 1771) in 1734 he gave a solution of the tautochrone problem which was more general than that given by Huygens, Newton, Euler or Jacob Bernoulli, and in 1737 he gave a solution to an orthogonal trajectories problem. The methods which he developed to solve these problems led to the calculus of variations. He used what he called the "fluxio-differential" method, so called because it used two independent first-order Leibniz type differential operators. This technique was praised by Johann Bernoulli, Euler and d'Alembert. Fontaine then used differential coefficients instead of differentials and Greenberg shows how Fontaine progressed from a calculus of variations to a calculus of several variables. *SAU




1814 Anders Jonas Ångström (13 August 1814, Lögdö, – 21 June 1874) was a Swedish physicist whose pioneering use of spectroscopy is recognized in the name of the angstrom, a unit of length equal to 10-10 meters. In 1853, he studied the spectrum of hydrogen for which Balmer derived a formula. He announced in 1862 that analysis of the solar spectrum showed that hydrogen is present in the Sun's atmosphere. In 1867 he was the first to examine the spectrum of aurora borealis (northern lights). He published his extensive research on the solar spectrum in Recherches sur le spectre solaire (1868), with detailed measurements of more than 1000 spectral lines. He also published works on thermal theory and carried out geomagnetical measurements in different places around Sweden.*TIS



1819 George Gabriel Stokes born. (13 August 1819 – 1 February 1903) (1st Baronet) British mathematical physicist who studied viscous fluids and formulated his law of viscosity for the speed of a solid sphere falling in a fluid. Other laws and mathematical work for which he is known includes Stokes's theorem, in the field of vector analysis. Stokes also worked in optics, the wave theory of light, diffraction (1849), the ultraviolet spectrum and other spectrum analysis. He investigated the nature of fluorescence and was a founder of the field of geodesy with his study of variations in gravity (1849). From 1849 until his death in 1903, he held the Lucasian Chair of Mathematics at Cambridge (held earlier by Isaac Newton, and more recently by Stephen Hawking). He came from a family with generations of scientists, mathematicians and engineers.*TIS

The formula now called Stokes Law





1861 Cesare Burali-Forti, born(13 August 1861 – 21 January 1931). He discovered the antinomy(paradox) of the class of all ordinals in 1897. He never held a permanent university position for he failed his libera docenze, or license to teach, because of the antagonism to the new methods of vector analysis on the part of some members of the examining committee. *VFR He was an assistant of Giuseppe Peano in Turin from 1894 to 1896, during which time he discovered what came to be called the Burali-Forti paradox of Cantorian set theory. He died in Turin.



1861 Herbert Hall Turner (13 August 1861, Leeds – 20 August 1930, Stockholm) was a British astronomer and seismologist.
He was educated at Clifton College and Trinity College, Cambridge. In 1884 he accepted the post of Chief Assistant at Greenwich Observatory and stayed there for nine years. In 1893 he became Savilian Professor of Astronomy and Director of the Observatory at Oxford University, a post he held for 37 years until his sudden death in 1930.
He was one of the observers in the Eclipse Expeditions of 1886 and 1887. In seismology, he is credited with the discovery of deep focus earthquakes. He is also credited with coining the word parsec.*Wik

He pioneered many of the procedures now universally employed in determining stellar positions from astronomical photographs. After serving as chief assistant at the Royal Greenwich Observatory for nine years, he spent most of his career as Savilian professor of astronomy at Oxford University. One of the leaders in the worldwide effort to produce an astrographic chart of the sky, he developed improved methods for obtaining both positions and magnitudes from photographic plates. *SAU

A few months before Turner's death in 1930, the Lowell Observatory announced the discovery of a new minor planet, and an eleven-year-old Oxford schoolgirl, Venetia Burney, proposed the name Pluto for it to her grandfather Falconer Madan, who was retired from the Bodleian Library Madan passed the name to Turner, who cabled it to colleagues at the Lowell Observatory in the United States. The new minor planet was officially named "Pluto" on 24 March 1930*Wik




1866 Frances Hardcastle (13 August 1866 – 26 December 1941) was an English mathematician, in 1894 one of the founding members of the American Mathematical Society. Her work included contributions to the theory of point groups.

Born in Writtle, just outside Chelmsford, Essex, Hardcastle was a daughter of Henry Hardcastle, a barrister, by his marriage in 1865 to Maria Sophia Herschel, daughter of the astronomer, mathematician, and chemist Sir John Herschel.

She was educated at Girton College (Tripos Part I 1891 & Part II 1892), and obtained a Certificate in Mathematics.

In 1892, she went to the University of Chicago for a year as an honorary fellow, then spent another year at Bryn Mawr College studying under Charlotte Scott. While at Bryn Mawr she was president of the Graduate Club and translated Felix Klein's book On Riemann's Theory of Algebraic functions and Integrals. In 1895, she recommenced postgraduate studies at Cambridge, and within a few years had published several papers on point-groups. She earned a BA degree from the University of London in 1903. Trinity College Dublin awarded her an MA (ad eundem) in 1905.

Hardcastle was one of 156 British women who publicly supported the aims of the International Congress of Women, held in The Hague in April 1915. These aims were, "1. To demand that international disputes shall in future be settled by some other means than war," and "2. To claim that women shall have a voice in the affairs of nations." Until 1909, she was an Honorary Secretary of the National Union of Women's Suffrage Societies (NUWSS). *Wik

*SAU



1866 Dr Clara Latimer Bacon (13 August 1866 – 14 April 1948) was a mathematician and Professor of Mathematics at Goucher College. She was the first woman to earn a PhD in mathematics from Johns Hopkins University.

In October 1907 she began graduate work at Johns Hopkins University in mathematics, education and philosophy. A fellowship from the Baltimore Association for Promotion of University Education of Women allowed her to spend the 1910-1911 academic year at the university. In 1911 she became the first woman to receive a Ph.D. in mathematics from Johns Hopkins University. Her dissertation was on "The Cartesian oval and the elliptic functions p and σ," later published in the American Journal of Mathematics, Vol. 35, No. 3. (July, 1913), pp. 261-280.
Bacon was promoted to associate professor at Goucher in 1905 and to full professor in 1914. She continued to teach at Goucher College until her retirement in 1934 as Professor Emeritus of Mathematics. She was by all accounts an outstanding teacher. One student wrote of her :

She believed in us so simply and so deeply that we could not disappoint her. When she felt that circumstances prevented us from doing all she hoped, she tried to change the circumstances. It was her support that made graduate study possible for me. Her patience and understanding as a teacher opened up the beauty of mathematics. For many years her faith in all of us made life seem good.
At least eight of her students went on to earn the Ph.D. degree in mathematics, 



1909  Fabio Conforto (13 August 1909 – 24 February 1954) was an Italian mathematician. His contributed to the fields of algebraic geometry, projective geometry and analytic geometry.*Wik 

The range of Conforto's mathematical publications is great with contributions to algebraic geometry, projective geometry, and analytic geometry. In addition, as we have seen above, he wrote articles on the history of mathematics, for example (with Guido Zappa) La geometria algebrica in Italia (dal 1939 a tutto il 1945) Ⓣ (1946) and La geometria proiettiva: suo sviluppo storico e suo significato Ⓣ (1949). 

Jean Dieudonné, reviewing a 1979 reprint of this article, writes that Conforto:-

... recalls briefly the well-known history of projective geometry, from Poncelet to von Staudt. He stresses the role of perspective as developed in art (especially by the Italians) in the birth of Desargues' ideas in the 17th century, and the analogous influence of the drawing techniques promoted by Monge ("descriptive geometry") on his students and especially on Poncelet. A special section is devoted to the Italian treatises on projective geometry, particularly those of Enriques and Severi. In a closing section the author rightly insists on the influence of projective geometry on the concepts of modern mathematics, in introducing such general notions as transformation, correspondence, invariant, and duality, and in giving one of the first examples of a "hypothetico-deductive system", where fundamental notions are created, as it were, by the axioms of the theory. *SAU





1927 Frances Sarnat Hugle (August 13, 1927 – May 24, 1968) was an American scientist, engineer, and inventor who contributed to the understanding of semiconductors, integrated circuitry, and the unique electrical principles of microscopic materials. She also invented techniques, processes, and equipment for practical (high volume) fabrication of microscopic circuitry, integrated circuits, and microprocessors which are still in use today.

In 1962, Hugle co-founded Siliconix, one of Silicon Valley's first semiconductor houses. She is the only woman included in the "Semiconductor Family Tree *Wik





1959 Steven Henry Strogatz (August 13, 1959, Torrington, Connecticut - ) is an American mathematician and the Jacob Gould Schurman Professor of Applied Mathematics at Cornell University. He is known for his contributions to the study of synchronization in dynamical systems, and for his work in a variety of areas of applied mathematics, including mathematical biology and complex network theory.

Strogatz recalled that as a young student, "when data he was plotting in a Physics lab created a curve he had met in algebra class.   While recording how the length of a pendulum string affects the time for the pendulum to complete a complete a swing;... it was as if the pendulum knew algebra."  *Loving + Hating Mathematics, Hersch and John-Steiner

In particular, his 1998 Nature paper with Duncan Watts, entitled "Collective dynamics of small-world networks", is widely regarded as a seminal contribution to the interdisciplinary field of complex networks, whose applications reach from graph theory and statistical physics to sociology, business, epidemiology, and neuroscience. As one measure of its importance, it was the most highly cited article about networks between 1998 and 2008, and the sixth most highly cited paper in all of physics.
Strogatz's writing includes the 1994 textbook Nonlinear Dynamics and Chaos, two popular books, and frequent newspaper articles. His most recent book, published in 2009, was The Calculus of Friendship, called "a genuine tearjerker" and "part biography, part autobiography and part off-the-beaten-path guide to calculus". His trade book Sync was chosen as a Best Book of 2003 by Discover Magazine. Strogatz also filmed a series of lectures on chaos theory for the Teaching Company, released in 2008, and, in late January 2010, Strogatz began writing a weekly column on mathematics in The New York Times. These columns, along with many others penned by Strogatz, will appear in a book slated for release in 2012. The New York Times columns have been described as "must reads for entrepreneurs and executives who grasp that mathematics is now the lingua franca of serious business analysis. *Wik 




1965 Kate Adebola Okikiolu (born 1965) is a British mathematician.She is known for her work with elliptic differential operators as well as her work with inner-city children.

Okikiolu was born in 1965 in England. Her father was George Olatokunbo Okikiolu, a renowned Nigerian mathematician and the most published black mathematician on record. Her British mother was a high school mathematics teacher. Okikiolu received a B.A. in mathematics from Cambridge University in 1987. In 1991 she earned her Ph.D. in mathematics from the University of California at Los Angeles, for her thesis The Analogue of the Strong Szego Limit Theorem on the Torus and the 3-Sphere.

Okikiolu was an instructor and later assistant professor at Princeton University from 1993 to 1995. She then worked as a visiting assistant professor at the Massachusetts Institute of Technology and joined the faculty at the University of California at San Diego in 1995. In 2011 she joined the Mathematics Department at Johns Hopkins University.

She was an invited speaker at the 1996 meeting of the Association of Women in Mathematics. She also delivered the Claytor-Woodard lecture at the 2002 meeting of the National Association of Mathematicians, an organization for African-American mathematicians.

In 1997, Okikiolu won a Sloan Research Fellowship, becoming the first black recipient of this fellowship. In 1997 she also was awarded a Presidential Early Career Award for Scientists and Engineers for both her mathematical research and her development of mathematics curricula for inner-city school children. This award is given to only 60 scientists and engineers each year and has a prize of $500,000.*Wik





DEATHS


1822 Jean Robert Argand, (July 18, 1768 – August 13, 1822) Argand Diagrams, the method of drawing complex numbers as vectors on a coordinate plane, are named for him, as an amateur mathematician he described them in a paper in 1806. A similar method, although less complete, had been suggested as early as 120 years before by John Wallis, and developed extensively by Casper Wessel(1745-1818), a Norwegian surveyor. (Actually, at the time Wessel lived, the area where he was born was a part of Denmark. Norway became an independent government in 1905 after years of domination by Denmark and Sweden.) It may be that even after these multiple discoveries, the method was unknown to Gauss and he had to rediscover it for himself in 1831 although it has been suggested that Gauss may have discovered the idea as early as Wessel. Some parts of his Demonstratio Nova would seem almost miraculously derived without a knowledge of the ideas of the geometry of complex numbers.
Wessel's paper was published in Danish, and was not circulated in the languages more common to mathematics at that time. It was not until 1895 that his paper came to the attention of the mathematical community, long after the name Argand Diagram had stuck. Incredibly, there were at least three more individuals who may have independently discovered and written on the same idea; Abbe Bruee, C. V. Mourney, and John Warren.
Argand's Book, Essai sur une maniere de representer les quantities imaginaires dans les constructions geometriques, might have suffered the same fate as Wessel except for an unusual chain of events. I give here the version as presented by Michael Crowe in his A History of Vector Analysis

In 1813 J. F. Francais published a short memoir in volume IV of Gergonne's Annales de mathematiques in which Francais presented the geometrical representation of complex numbers. At the conclusion of his paper Francais stated that the fundamental ideas in his paper were not his own, he had found them in a letter written by Legendre to his (Francis') brother who had died. In this letter Legendre discussed the ideas of an unnamed mathematician. Francis added that he hoped this mathematician would make himself known and publish his results.
The unnamed mathematician had in fact already published his ideas, for Legendre's friend was Jean Robert Argand. Hearing of Francais' paper, Argand immediately sent a communication to Gergonne in which he identified himself as the mathematician in Legendre's letter, called attention to his book, summarized its contents, and finally presented an (unsuccessful) attempt to extend his system to three dimensions.

Even with so much interest and attention to the geometry of complex numbers, it was not until Gauss published a short work on the ideas that they became popular.
Translations of both Wallis' and Wessel's papers on the imaginaries can be found in A Sourcebook of Mathematics by David Eugene Smith. (*pb)




1882 Logician William Stanley Jevons died (1 September 1835 – 13 August 1882) . He was a British economist and logician.
Irving Fisher described his book The Theory of Political Economy (1871) as beginning the mathematical method in economics. It made the case that economics as a science concerned with quantities is necessarily mathematical. In so doing, it expounded upon the "final" (marginal) utility theory of value. Jevons' work, along with similar discoveries made by Carl Menger in Vienna (1871) and by Léon Walras in Switzerland (1874), marked the opening of a new period in the history of economic thought. Jevons' contribution to the marginal revolution in economics in the late 19th century established his reputation as a leading political economist and logician of the time. *Wik



1884 Rufus Porter (May 1, 1792 – August 13, 1884) was an American painter, inventor, and founder of Scientific American magazine.  He put out the first issue of Scientific American on 28 Aug 1845, but sold that business 10 months later to Orson Munn and Alfred Ely Beach. He editted it for one more year. 
As an inventor, he had little business sense, but held over 100 patents, including a fire alarm, signal telegraph, fog whistle, and a washing machine. He sold his patent for a revolving rifle to Samuel Colt for $100 in 1844. He had an interest in painting portraits, and in 1820 built a camera obscura. From 1820, he became interested in the hot-air balloon. He constructed his first model in 1833. Porter built and exhibited other models. By 1853, he demonstrated a 22-foot model airship which circled in the rotunda of the New York Merchant's Exchange. Ultimately, despite trying, he had no major success in aerial navigation.*TIS
Rufus Porter advertisement for his 1849 New York to California transport





1907 Hermann Karl Vogel (April 3, 1841 – August 13, 1907) German astronomer who discovered spectroscopic binaries (double-star systems that are too close for the individual stars to be discerned by any telescope but, through the analysis of their light, have been found to be two individual stars rapidly revolving around one another). He pioneered the study of light from distant stars, and introduced the use of photography in this field.*TIS



1910 Florence Nightingale​ died; (May 12, 1820 – August 13, 1910) She is best remembered for her work as a nurse during the Crimean War​ and her contribution towards the reform of the sanitary conditions in military field hospitals. However, what is less well known about this amazing woman is her love of mathematics, especially statistics, and how this love played an important part in her life's work. *SAU Florence Nightingale had exhibited a gift for mathematics from an early age and excelled in the subject under the tutorship of her father. Later, Nightingale became a pioneer in the visual presentation of information and statistical graphics. Among other things she used the pie chart, which had first been developed by William Playfair in 1801. While taken for granted now, it was at the time a relatively novel method of presenting data.
Indeed, Nightingale is described as "a true pioneer in the graphical representation of statistics", and is credited with developing a form of the pie chart now known as the polar area diagram (This diagram, commonly known as the Nightingale rose, was created in collaboration with medical statistician William Farr, one of the most significant influences on medical statistics in the 19th century.), or occasionally the Nightingale rose diagram, equivalent to a modern circular histogram, in order to illustrate seasonal sources of patient mortality in the military field hospital she managed. Nightingale called a compilation of such diagrams a "coxcomb", but later that term has frequently been used for the individual diagrams. She made extensive use of coxcombs to present reports on the nature and magnitude of the conditions of medical care in the Crimean War to Members of Parliament and civil servants who would have been unlikely to read or understand traditional statistical reports.*Wik



1957  Fredrik (Carl Mülertz) Størmer ( 3 Sep 1874,13 Aug 1957  ) was a Norwegian geophysicist and mathematician who developed a mathematical theory of auroral phenomena. An aurora is the light emitted by energetic protons and electrons at the top of Earth's atmosphere when they come in contact with solar wind particles. He also contributed both important photographic observations and mathematical data to the understanding of the polar aurora, of stratospheric and mesospheric clouds, and of the structure of the ionosphere. The discovery of the Van Allen Radiation Belts by James Van Allen confirmed with surprising accuracy Størmer's theoretical analysis of solar charged particle trajectories in Earth's magnetic field. TiS



1968 
Subbaramiah Minakshisundaram (12 October 1913 - 13 August 1968), also known as Minakshi or SMS, was an Indian mathematician who worked on partial differential equations and heat kernels. In 1946, he worked at the Institute for Advanced Study in Princeton, America, where he met Åke Pleijel. In 1949, the two wrote a paper together called, Some properties of the eigenfunctions of the Laplace-operator on Riemannian manifolds, in which they introduced the Minakshisundaram-Pleijel zeta function.

On the 13th of August 1968, Subbaramiah suffered a heart attack and died at the age of 55.




1968 Oystein Ore, (7 October 1899 in Oslo, Norway – 13 August 1968 in Oslo) Ore is known for his work in ring theory, Galois connections, and most of all, graph theory. His early work was on algebraic number fields, how to decompose the ideal generated by a prime number into prime ideals. He then worked on noncommutative rings, proving his celebrated theorem on embedding a domain into a division ring. He then examined polynomial rings over skew fields, and attempted to extend his work on factorisation to non-commutative rings.
In 1930 the Collected Works of Richard Dedekind were published in three volumes, jointly edited by Ore and Emmy Noether. He then turned his attention to lattice theory becoming, together with Garrett Birkhoff, one of the two founders of American expertise in the subject. Ore's early work on lattice theory led him to the study of equivalence and closure relations, Galois connections, and finally to graph theory, which occupied him to the end of his life. Ore had a lively interest in the history of mathematics, and was an unusually able author of books for laypeople, such as his biographies of Cardano and Niels Henrik Abel.*Wik



2008 Henri Cartan (July 8, 1904 – August 13, 2008)is known for work in algebraic topology, in particular on cohomology operations, the method of "killing homotopy groups", and group cohomology. His seminar in Paris in the years after 1945 covered ground on several complex variables, sheaf theory, spectral sequences and homological algebra, in a way that deeply influenced Jean-Pierre Serre, Armand Borel, Alexander Grothendieck and Frank Adams, amongst others of the leading lights of the younger generation. The number of his official students was small, but includes Adrien Douady, Roger Godement, Max Karoubi, Jean-Louis Koszul, Jean-Pierre Serre and René Thom.
Cartan also was a founding member of the Bourbaki group and one of its most active participants. His book with Samuel Eilenberg Homological Algebra (1956) was an important text, treating the subject with a moderate level of abstraction and category theory.*Wik




Credits :
*CHM=Computer History Museum
*FFF=Kane, Famous First Facts
*NSEC= NASA Solar Eclipse Calendar
*RMAT= The Renaissance Mathematicus, Thony Christie
*SAU=St Andrews Univ. Math History
*TIA = Today in Astronomy
*TIS= Today in Science History
*VFR = V Frederick Rickey, USMA
*Wik = Wikipedia
*WM = Women of Mathematics, Grinstein & Campbell