Only professional mathematicians learn anything from professors.
Other people learn from explanations.
Other people learn from explanations.
~Ralph Boas
The 235th day of the year; 235 is the number of trees with 11 vertices.
(Counting the number of unlabeled free trees is still an open problem in math. No closed formula for the number of trees with n vertices up to graph isomorphism is known.)
235, like all numbers ending in 5 that are greater than 25, is the difference of two squares of integers that differ by five, 26^2 - 21^2 = 235. Like all odd numbers, it is the difference of two consecutive squares, 235 = 118^2 - 117^2.
If you build an equilateral triangle with nine matchsticks on each side, then subdivide into additional equilateral triangles, there will be a total of 235 triangles of several different sizes. The image shows the subdivision of a equilateral triangle with three matchsticks on a side. Can you find the thirteen triangles in it?
1450 Gutenberg borrowed 800 guilden in gold at 6% interest (a low rate then) to develop his invention of printing from movable metal type. The first book produced was a 42-line Latin Bible, the famous Gutenberg Bible. [G. H. Putnam, Books and Their Makers During the Middle Ages (1896), p. 361]. *VFR
1676 Ole Rømer's conjecture that the speed of light was finite may have appeared in a presentation to the Royal Academy of Sciences in Paris on August 22, "This second inequality appears to be due to light taking some time to reach us from the satellite; light seems to take about ten to eleven minutes [to cross] a distance equal to the half-diameter of the terrestrial orbit." His final calculations of 220,000 Km/sec were presented to the Academy on 22 November, but the record of that meeting has been lost. The first public notice occurred on Dec 7, 1676 in the Journal des sçavans. *Wik
1850 Michael Faraday in a letter to William Whewell writes, "I have been driven to assume for some time, especially in relation to the gases, a sort of conducting power for magnetism. Mere space is Zero. One substance being made to occupy a given portion of space will cause more lines of force to pass through that space than before, and another substance will cause less to pass. The former I now call Paramagnetic & the latter are the diamagnetic. The former need not of necessity assume a polarity of particles such as iron has with magnetic, and the latter do not assume any such polarity either direct or reverse. I do not say more to you just now because my own thoughts are only in the act of formation, but this I may say: that the atmosphere has an extraordinary magnetic constitution, & I hope & expect to find in it the cause of the annual & diurnal variations, but keep this to yourself until I have time to see what harvest will spring from my growing ideas." * L. P. Williams (ed.), The Selected Correspondence of Michael Faraday (1971), Vol. 2, 589.
1883 Sylvester writes Cayley that, "I have been recovering my theory of multiple algebras - by slow degrees." Thus begins his first sustained assault on Matrix Theory. *The Emergence of the American Mathematical Research Community, 1876-1900, Parshal & Rowe
1900 It seems that Henry Ernest Dudeney may have been the first person to explore the use of primes to create a magic square. He gave the problem of constructing a magic in The Weekly Dispatch, 22nd July and 5th August 1900. At that time, 1 was sometimes (often?) considered as a prime number. His magic square gives the lowest possible sum for a 3x3 using primes (assuming one is prime)
*Christian Boyer, Multimagic Squares
1955 The first computer User Group is founded. SHARE was founded by users of IBM's Model 704 computer, ... in order for the growing community of IBM computer users (mainly aerospace companies on the U.S. West Coast) to exchange information and programs. The first meeting included scientists and engineers whose companies had ordered IBM's newest computer, the 704. Sparked by quick growth and the fact that its members were some of IBM's largest customers, the group had significant influence over IBM designs and customer support. *CHM
On August 22, 2006, four Fields Medals were awarded at the opening ceremonies of the Inter-
national Congress of Mathematicians (ICM) in Madrid, Spain. The medalists are ANDREI O KOUNKOV, GRIGORY PERELMAN, TERENCE TAO, and WENDELIN WERNER.
During the award ceremony, John Ball, president of the International Mathematical
Union, announced that Perelman declined to accept. Tao became one of the youngest persons, the first Australian, and the first UCLA faculty member ever to be awarded a Fields Medal. *AMS Notices
1647 Denis Papin (22 Aug 1647; c1712) French-born British physicist who invented the pressure cooker (1679). He assisted Dutch physicist Christiaan Huygens with air-pump experiments, and went to London in 1675 to work with the English physicist Robert Boyle. A few years later, Papin invented his steam digester (pressure cooker), a closed vessel with a tightly fitting lid that confined the steam at a higher pressure, considerably raising the boiling point of the water. A safety valve of his own invention prevented explosions. Observing that the enclosed steam in his cooker tended to raise the lid, Papin conceived of the use of steam to drive a piston in a cylinder, the basic design for early steam engines. He never built an engine of his own, but his idea was improved by others and led to the development of the steam engine, a major contribution to the Industrial Revolution. *TIS If you are not familiar with Papin, check out this blog by The Renaissance Mathematicus.
1796 Baden Powell (22 August 1796–11 June 1860 Kensington, London) born in Stamford Hill, England. Savilian professor of geometry at Oxford from 1827 to 1854. He deserves credit for the modest reforms in mathematical education at Oxford in the 1850s. One son (he had 14 children by 3 wives) Robert Baden-Powell founded the scouting movement. *VFR He fought for the principle acknowledging scientific advances were compatible with Christian religion. Following Darwin's "Origin of Species" in 1859, he contributed one of seven essays in "Essays and Reviews," 1860. This was violently attacked, and the authors denounced as being inspired by "the Evil One himself." "There was some expectation of him becoming a Bishop, before Essays and Reviews were published" (letter from his widow to her nephew 20.8.1909). *Pinetreeweb.com
1834 Samuel Pierpont Langley, (22 Aug 1834; 27 Feb 1906)American astronomer, physicist, and aeronautics pioneer who built the first heavier-than-air flying machine to achieve sustained flight. He launched his Aerodrome No.5 on 6 May 1896 using a spring-actuated catapult mounted on top of a houseboat on the Potomac River, near Quantico, Virginia. He also researched the relationship of solar phenomena to meteorology. *TIS
Developed a bolometer (for measurements of the cosmic microwave background) and determent the value of the solar constant.*Wik
1915 James Hillier, OC (August 22, 1915 – January 15, 2007) was a Canadian-born scientist and inventor who designed and built, with Albert Prebus, the first successful high-resolution electron microscope in North America in 1938. *Wik
1676 Edward Cocker (1631 – 22 August 1676) was an English scholar who was the author of an influential arithmetic text which ran to more than 100 editions. Cocker died with no money in his Poke to quote his own phrase. As Wallis writes
Subsequently he might well have suffered material loss in the Fire and have had the expense of successive removals. He may also have spent extravagantly. He possessed 'some choice Manuscripts, and a great Collection of Printed Authors in several Languages' ... In any event, he died in debt, 'within the rules' of the King's Bench Prison, which was situated in Southwark; the quoted phrase meant that the prisoner had purchased the right to live within a short distance of the prison. Cocker's move to Southwark was probably an enforced one, consequent on his committal for debt.*SAU
Benjamin Franklin's autobiography makes mention that he studied ..., Cocker's Arithmetic, after he moved from his home to Pennsylvania, " And now it was that, being on some occasion made asham'd of my ignorance in figures, which I had twice failed in learning when at school, I took Cocker's book of Arithmetick, and went through the whole by myself with great ease.
1700 Siguenza y Gongora (August 14, 1645 – August 22, 1700) was a Mexican astronomer and philosopher. *SAU He 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 1681 Sigüenza wrote the book "Philosophical Manifest Against the Comets" in which he tried to dismiss fears of impending superstitious predictions based from astrology; in the work he takes steps to separate the fields of astrology and astronomy. The jesuit Eusebio Kino strongly criticized the texts written by Sigüenza because they were contradicting to established Catholic beliefs in the heavens. Sigüenza often cited authors like Copernicus, Galileo, Descartes, Kepler, and Brahe. In 1690 Sigüenza took an audacious move to defend his previous work by publishing "Libra Astronómica y Filosófica". *Wik
1752 William Whiston (born 9 Dec 1667, 22 Aug 1752) English Anglican priest and mathematician who sought to harmonize religion and science, and who is remembered for reviving in England the heretical views of Arianism. He attended Newton's lectures while at Cambridge and showed great promise in mathematics. Ordained in 1693. While chaplain to the bishop of Norwich (1694-98), he wrote A New Theory of the Earth (1696), in which he claimed that the biblical stories of the creation, flood and final conflagration could be explained scientifically as descriptions of events with historical bases. The Flood, he believed, was caused by a comet passing close to the Earth on 28 Nov 2349 BC. This put stress on the Earth's crust, causing it to crack and allow the water to escape and flood the Earth. After serving as vicar of Lowestoft (1698–1701), he returned to his alma mater, Cambridge University to become assistant to the mathematician Sir Isaac Newton, whom he succeeded as professor in 1703. *TIS (His translations of the works of Josephus are still in print)
1907 Platon Sergeevich Poretsky (October 3, 1846, Elisavetgrad - August 9, 1907) He published major works on methods of solution of logical equations, and on the reverse mode of mathematical logic. He applied his logic calculus to the theory of probability. Although he retired from his teaching role at Kazan in 1889 due to ill health, this did not mean that he stopped his research. He continued to undertake research into mathematical logic for the remaining eighteen years of his life. *SAU
1940 Sir Oliver Joseph Lodge, FRS (12 June 1851 – 22 August 1940) was a British physicist and writer involved in the development of key patents in wireless telegraphy. In his 1894 Royal Institution lectures ("The Work of Hertz and Some of His Successors"), Lodge coined the term "coherer" for the device developed by French physicist Édouard Branly based on the work of Italian physicist Temistocle Calzecchi Onesti. In 1898 he was awarded the "syntonic" (or tuning) patent by the United States Patent Office. He was also credited by Lorentz (1895) with the first published description of the length contraction hypothesis, in 1893, though in fact Lodge's friend George Francis FitzGerald had first suggested the idea in print in 1889. *Wik
1974 Jacob Bronowski, (18 Jan 1908, 22 Aug 1974)Polish-born British mathematician and man of letters who eloquently presented the case for the humanistic aspects of science. He is remembered as writer and presenter of the BBC television series, The Ascent of Man. Bronowski, who had a Ph.D. in algebraic geometry, spent WW II in Operations Research, and was an official observer of the after-effects of the Nagasaki and Hiroshima bombings. After this experience, he turned to biology, to better understand the nature of violence. *TIS
1975 Andrzej Mostowski (1 November 1913 – 22 August 1975) was a Polish mathematician who worked on logic and the foundations of mathematics.*SAU His son Tadeusz is also a mathematician working on differential geometry. With Krzysztof Kurdyka and Adam Parusinski, Tadeusz Mostowski solved René Thom's gradient conjecture in 2000. *Wik
1992 Harold Maile Bacon (Jan. 13, 1907, August 22, 1992) was an elder statesmen of the Stanford faculty who taught calculus to generations of Stanford undergraduates during a career that spanned more than four decades.
Bacon was widely recognized on campus as the owner of the white colonial-style Row house with the rose-lined driveway. He had ties to the house, and the University, almost since his birth.
He was an ill 6-month-old child when he first visited the campus house he would occupy for more than 60 years. Harriet Dunn, a cousin of Harold Bacon's father, Robert, and owner of the distinctive house, suggested that the child be brought to Stanford from Southern California for examination by Dr. Ray Lyman Wilbur, who lived nearby on the site now occupied by Dinkelspiel Auditorium. (Wilbur, who prescribed medicine and a better diet for young Bacon, later became the university's third president.)
In the 1920s, Harold Bacon enrolled at Stanford, following in the footsteps of his father, who graduated in 1902. Bacon lived in the two-story, six-bedroom house during part of his undergraduate years, then moved in permanently , at the invitation of Harriet Dunn, when he returned in 1930 to teach.
For many years, Bacon directed the undergraduate program in mathematics, according to Halsey Royden, who took classes from Bacon during his student days and later became a faculty colleague.
To students and fellow faculty members, Bacon was "the embodiment of Stanford ways and history," Royden said. At the time he retired, Bacon, through his calculus classes, probably had taught "more engineering and science undergraduates than anyone else in the history of the university," Royden said.
*Stanford Obituary
For a wonderful story describing the nature of Harold Bacon as a man and a teacher, see this cover story, The Prisoner and the Professor, from the Stanford Alumni magazine of Mar/Apr 1997
3×3 magic square consisting of primes only having the smallest possible magic constant (Madachy 1979, p. 95; attributed to R. Ondrejka)
$$
\begin{bmatrix}
17 & 89 & 71 \\
113 & 59 & 5 \\
47 & 29 & 101
\end{bmatrix}
$$
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
3 comments:
I thought the quote was "Only professional mathematicians learn anything from proofs..."
You may be write, or perhaps it was "Einstein who said it." I just checked and found my version here, but.... www.onlinemathlearning.com/mathematicians-math-quotes.html
Or even "RIGHT" arrrgggghhhhh
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