Tuesday, 29 August 2023

On This Day in Math - August 29

 


Jeannie at VLA



In most sciences one generation tears down what another has built,
and what one has established, another undoes.
In mathematics alone each generation adds a new story to the old structure.
~Hermann Hankel


The 241st day of the year; 241 is the larger of a pair of twin primes. The larger of a pair of twin primes is always one more than a multiple of six; the smaller is always one less than a multiple of six.

2+4+1 is prime. 241 is the 53rd prime. (53 is also prime) *Derek Orr

241 is also The smallest prime p such that p plus the reversal of p equals a palindromic prime.  241 + 142 = 383; which is a prime palindrome.

And it is the largest known prime p such that the reversal of (p! + p) is prime.  (241! + 241 ends with a string of fifty-five zeros, and then 241 :
980360372638941007038951797078339359751464353463061342202811
188548638347461066010066193275864531994024640834549254693776
854464608509281547718518965382728677985343589672835884994580
815417004715718468026937051493675623385569404900262441027874
255428340399091926993707625233667755768320823071062785275404
107485450075779940944580451919726756974354635829128751944137
27644867102380111026020691554782580923999494640500736
000000000000000000000000000000000000000000000000000000

P. Honaker at Prime Curios points out that the sequence of primes formed by n!+239 begins, 241, 263, 359... Maybe I mis-searched but I did not find this sequence in OEIS. Seems like a good computer programming project for students, pick a prime and find primes of the form n! + p
John Cook posted that "if k is relatively prime to b, there is a multiple of k whose base b representation contains all ones. If I understand that then since 241 is prime, it is relatively prime to ten. Can you find the base ten multiple of k that has all ones for its digits? Be the first to share the answer with me and get immortality by being listed here. I think it must be a very large multiple of 241.

241 = 15^2 + 4^2 which means 241 is a Pythagorean Prime.

241 is a palindrome in duodecimal, base 12 (181) and a repdigit in base 15(111)


See More Math Facts for every Year Day, here




EVENTS


1609 Galileo writes to his brother in Florence to tell him about his telescope presentation to the Doge on the 24th of August.


1654 Fermat to Pascal Saturday, August 29, 1654

Monsieur,
Our interchange of blows still continues, and I am well pleased that our thoughts are in such complete adjustment as it seems since they have taken the same direction and followed the same road. Your recent Trait´e du triangle arithmetique and its applications are an authentic proof and if my computations do me no wrong, your eleventh consequence went by post from Paris to Toulouse while my theorem, on figurate numbers, which is virtually the same, was going from Toulouse to Paris. I have not been on watch for failure while I have been at work on the problem and I am persuaded that the true way to escape failure is by concurring with you. But if I should say more, it would he of the nature of a Compliment and we have banished that enemy of sweet and easy conversation. It is now my turn to give you some of my numerical discoveries, but the end of the parliament augments my duties and I hope that out of your goodness you will allow me due and almost necessary respite.

In the same letter he states that, "Meditate however, if you find it convenient, on this theorem: The squared powers of 2 augmented by unity [I.e. 22n+1] are always prime numbers. [That is,] The square of 2 augmented by unity makes 5 which is a prime number;The square of the square makes 16 which, when unity is added makes 17, a prime number; The square of 16 makes 256 which, when unity is added, makes 257, a prime number; The square of 256 makes 65536 which, when unity is added, makes 65537, a prime number; and so to infinity. This is a property whose truth I will answer to you. The proof of it is very difficult (impossible, since the statement, as Euler would show later, is not true) and I assure you that I have not yet been able to find it fully." * York University Maths Dept


1692 For his services to the field of astronomy, Johann Philipp von Wurzelbauer was ennobled in 1692 by Leopold I, Holy Roman Emperor and added the von to his name. *Wik


1740 In a letter to Euler dated August 29th, 1740, Philippe Naudé (the Younger) asked Euler in how many ways a number n can be written as a sum of positive integers. In his answer written on September 12th (23rd), Euler explained that if we denote
this “partition number” by p(n), then

*Correspondence of Leonhard Euler with Christian Goldbach, Springer


1831 Michael Faraday discovered electrical induction. *VFR In 1831, Michael Faraday wound a thick iron ring on one side with insulated wire that was connected to a battery. He then wound the opposite side with wire connected to a galvanometer. He found that upon closing the battery circuit, there was a deflection of the galvanometer in the second circuit. Then he was astonished to see the galvanometer needle jump in the opposite direction when the battery circuit was opened. He had discovered that a current was induced in the secondary when a current in the primary was connected and an induced current in the opposite direction when the primary current was disconnected.*TIS


1859 Amateur English astronomers Richard Carrington and Richard Hodgson, independently observed a "white light flare" emanating from the surface of the sun. Less than a day later, Earth's magnetic field was knocked awry. Across America and Europe, telegraph wires sparked and failed.
Fewer than 18 hours elapsed between the flare and the geomagnetic storm on Earth. That meant whatever had exploded off the sun must have traveled at more than 5 million miles per hour. *NY Times




1899 Dedekind sends a letter to Georg Cantor that includes a proof of the Schroder-Bernstein Theorem (Let A and B be sets. If there is a 1-1 correspondence from A to B and a 1-1 corespondence from B to A, then the sets have the same cardinality.) *Cantorian Set Theory and Limitation of Size By Michael Hallett


In 1940, Sir Henry Tizard led a mission of leading British and Canadian scientists to the USA to brief official American representatives on devices under active development for war use and to enlist the support of American scientists. Thus began a close cooperation of Anglo-American scientists in such fields as aeronautics and rocketry. His influence probably made the difference between defeat or victory at the Battle of Britain in 1940. *TIS


1949 the USSR tested their first atomic device, "First Lightning." It was an an implosive type plutonium bomb, detonated at the Semipalatinsk test range, giving up to a 20 kiloton yield. In the U.S. it was called Joe No. 1 ("Joe" was nickname for Y. Stalin.) This event came five years earlier than anyone in the West had predicted, largely due to one man, the spy Klaus Fuchs. As a Los Alamos physicist, Fuchs had passed detailed blue prints of the original American Trinity bomb design to the Russians. With the emergence of the USSR as a nuclear rival, America's monopoly of atomic weaponry was ended giving the U.S. strong motivation for intensifying its program of nuclear testing. Thus the Cold War was launched.*TIS


1970 Oscar Morgenstern writes in his diary that Gödel would NOT publish his ontological proof for the existence of God. The first version of the ontological proof in Gödel's papers is dated "around 1941". Gödel is not known to have told anyone about his work on the proof until 1970, when he thought he was dying. In February, he allowed Dana Scott to copy out a version of the proof, which circulated privately. In August 1970, Gödel told Oskar Morgenstern that he was "satisfied" with the proof, but Morgenstern recorded in his diary entry for 29 August 1970, that Gödel would not publish because he was afraid that others might think "that he actually believes in God, whereas he is only engaged in a logical investigation (that is, in showing that such a proof with classical assumptions (completeness, etc.) correspondingly axiomatized, is possible) *Wik


1990 The British Computer Misuse Act goes into effect One of the earliest laws anywhere designed to address computer fraud, the Act resulted from a long debate in the 1980s over failed prosecutions of hackers -- in one well-publicized case, two men hacked into a British Telecom computer leaving messages in the Duke of Edinburgh's private mailbox. *CHM





BIRTHS


1756 Jan Śniadecki (August 29, 1756– November 9, 1830) was a Polish mathematician, philosopher and astronomer at the turn of the 18th and 19th centuries.
Born in Żnin, Śniadecki studied at Kraków University and in Paris. He was rector of the Imperial University of Vilnius, a member of the Commission of National Education, and director of astronomical observatories at Kraków and Vilnius. He died at Jašiūnai Manor near Vilnius.
Śniadecki published many works, including his observations on recently discovered planetoids. His O rachunku losów (On the Calculation of Chance, 1817) was a pioneering work in probability. *Wik He is considered as the best Polish mathematician born in the 18th century.


1876 Charles F. Kettering (29 Aug 1876; 25 Nov 1958) was an American engineer whose 140 patents included the electric starter, car lighting and ignition systems. In his early career, with the National Cash Register Co., Dayton (1904-09), he created the first electric cash register with an electric motor that opened the drawer. When he co-founded the Dayton Engineering Laboratories Company (DELCO, with Edward A. Deeds) he invented the key-operated self-starting motor for the Cadillac (1912) and it spread to nearly all new cars by the 1920's. As vice president and director of research for General Motors Corp. (1920-47) he developed engines, quick-drying lacquer finishes, anti-knock fuels, and variable-speed transmissions.*TIS


1881 Ferdinand Springer born, The founder of an important publishing house,. Today Springer-Verlag is one of the most important publishers of advanced work on mathematics. *VFR


1904 Leonard Roth (29 August 1904 Edmonton, London, England – 28 November 1968 Pittsburgh, Pennsylvania) British Mathematician who worked primarily in Algebraic Geometry. *SAU




DEATHS


1873 Hermann Hankel (14 February 1839 - 29 August 1873) He studied and worked with, among others, Möbius, Riemann, Weierstrass and Kronecker. His 1867 exposition on complex numbers and quaternions is particularly memorable. For example, Fischbein notes that he solved the problem of products of negative numbers by proving the following theorem: "The only multiplication in R which may be considered as an extension of the usual multiplication in R+ by respecting the law of distributivity to the left and the right is that which conforms to the rule of signs." *Wik


1930 James Bolam (1839 in Newcastle, England - 29 Aug 1930 in St Helen's, Drumchapel, Dumbartonshire, Scotland) was educated at Newcastle. He became head of the Government Navigation School (later the Leith Nautical College). He was a founder member of the EMS and became an honorary member in 1923. *SAU


1937 Otto Ludwig Hölder (December 22, 1859 – August 29, 1937) worked on the convergence of Fourier series and in 1884 he discovered the inequality now named after him. He became interested in group theory through Kronecker and Klein and proved the uniqueness of the factor groups in a composition series. *SAU


1967 Charles Brace Darrow (10 Aug 1889, 29 Aug 1967) was an American inventor who designed the board game Monopoly. He had invented the game on 7 Mar 1933, though it was preceded by other real-estate board games. On 31 Dec 1935, a patent was issued for the game of Monopoly assigned to Parker Brothers, Inc., by Charles Darrow of Pennsylvania (No. 2,026,082). The patent titled it a "Board Game Apparatus" and described it as "intended primarily to provide a game of barter, thus involving trading and bargaining" in which "much of the interest in the game lies in trading and in striking shrewd bargains." Illustrations included with the patent showed not only the playing board and pieces, cards, and the scrip money. *TIS

The history of Monopoly can be traced back to 1903, when American anti-monopolist Lizzie Magie created a game that she hoped would explain the single-tax theory of Henry George. It was intended as an educational tool, to illustrate the negative aspects of concentrating land in private monopolies. She took out a patent in 1904. Her game, The Landlord's Game, was self-published, beginning in 1906.

According to an advertisement placed in The Christian Science Monitor, Charles Todd of Philadelphia recalled the day in 1932 when his childhood friend Esther Jones and her husband, Charles Darrow, came to their house for dinner. After the meal, the Todds introduced Darrow to The Landlord's Game, which they then played several times. The game was entirely new to Darrow, and he asked the Todds for a written set of the rules. After that night, Darrow went on to utilize this, and distribute the game himself as Monopoly.

The Parker Brothers bought the game's copyrights from Darrow. When the company learned Darrow was not the sole inventor of the game, it bought the rights to Magie's patent for $500.

Parker Brothers began marketing the game on November 5, 1935 *Wik 


The Landlord Game *Wik 



1975 Éamon de Valera (14 October 1882, 29 August 1975) was one of the dominant political figures in twentieth century Ireland, serving as head of government of the Irish Free State and head of government and head of state of Ireland. He also introduced the Constitution of Ireland.
De Valera was a leader of Ireland's struggle for independence from Britain in the Irish War of Independence and of the anti-Treaty forces in the ensuing Irish Civil War (1922–23). In 1926, he founded Fianna Fáil and was head of government from 1932–48, 1951–54 and 1957–59 and President of Ireland from 1959–73.
In his youth he had trained as a mathematician and taught mathematics prior to the Easter Rising. Throughout his life he maintained an interest in mathematics and returned to it with a passion in his later life. *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

Monday, 28 August 2023

Not The End for the Happy Ending Couple

*Wik


On 28 August 2005, Esther Klein and her husband George passed away within an hour of each other. An unusual event made even more interesting by a beautiful mathematical problem, that linked them together, and spawned the mathematical areas called Ramsey Theory, and Combinatorial Geometry.

In 1933 a group of mostly male students met regularly in Budapest to discuss mathematics. At one such meeting, one of (perhaps the only??) women present, Esther Klein, asked a simple geometric question: Is it possible to place five points on a plane so that no four of them form a convex quadrilateral? None of the student's present could answer her challenge; a fact made more impressive in that one of the students was Paul Erdos, one of the most prolific problem solvers in mathematics history.  Another student present was George Szekeres, another prolific mathematician working in combinatorial mathematics and a prominent player in the problem Esther submitted.

Esther then went on to illustrate her proof. Today the problem and it's generalization is regarded as one of the foundational works in the field of combinatorial geometry.

Within four years, Esther and George were married, and Paul Erdos dubbed the problem the Happy Ending Problem as he felt it was the start of their relationship.



The common proof used today for the problem is to divide it into simple cases. It is assumed that the points are in general position, that is, no three are collinear. Pick three of the points to form a triangle. If any point(s) is outside the triangle, then a convex quadrilateral can be drawn using four points. For the case when the two other points are inside the triangle, the segment containing these two points and one side of the triangle can be united into a convex quadrilateral. Also see the nice illustration at Theorem of the Day.

Erdos and George Szekeres generalized the problem to the theorem: For any positive integer N, any sufficiently large finite set of points in the plane in general position has a subset of N points that form the vertices of a convex polygon.
But HOW BIG was a "sufficiently large finite set of points" for a given convex n-gon? For a triangle, three points was all that was necessary. For a quadrilateral, Esther had shown that five points would suffice. Erdos and George predicted that for a pentagon, it would require nine points, but the complete proof was not published until 1970. Shortly after the death of George and Esther Szekeres, the solution for a hexagon was published in the ANZIAM Journal. The paper, Computer solution to the 17-point Erdös-Szekeres problem by George Szekeres(deceased)and
Lindsay Peters, showed that for a convex hull of six sides, the required number would be 17 points. (A challenging problem for students would be to create 16 points in general position so that no six formed a convex hexagon.)
Beyond that.... we just don't know. It must be a finite number, and we know from another Erdos-Sekeres proof that for an n-gon, the number of points is greater than or equal to 1 + 2(n-2).  That would mean that to guarantee a convex polygon, there must be at least nine points in the plain with no three co-linear.  

Paul Erdos used to talk about "God's Book." A list of all the best solutions to every mathematical problem. Maybe they got a peak after they left this plane. And Happily, the generalized Happy Ending problem has not ended for us still here. Care to try for a convex heptagon.

Wednesday, 23 August 2023

The Subfactorial and Some Historical Notes

Subfactorial the name subractorial was created by W. A Whitworth in The Messenger of Mathematics in May of 1877.  The symbol for the subfactorial is !n, a simple reversal of the use of the exclamation for n-factorial. This was not the symbol used by Whitworth, as at this time many people preferred what is called the Jarret symbol for the factorial. Whitworth added an extra line in the L to make the subfactorial. This symbol for the factorial persisted into the 1950's.  (Notes on the History of the factorial and its symbols.)


.The subractorial, or derangement is about counting the number of ways to take objects which have some order, and arranging them so that none is in its right ordered place.  The numbers 1, 2, 3 can be arranged for example, as 2,3,1, or 3,1,2.  The problem was first considered by Pierre Raymond de Montmort in 1708, and first solved by him in 1713. 

Cajori mentioned the use by George Chrystal (1851-1911) of a subfactorial symbol using N with an upside down exclamation point, but does not mention at all the !n that is the common present symbol, leading me to believe it was created after 1929.



Crystal's books into the fifties continued to use the inverted exclamation symbol and the National Academy of Sciences used the symbol in 1967.
The earliest used of the !n symbol I have ever found is from 1958, In the MAA questions section:


This was obviously not an instant hit, as I received several comments like the following after a post in 2009.
"  I have several books on my shelf, none of which use !n notation.
D(n)
- Matoušek and Nešetřil, 1998
- Niven, 1965. I teach from this book.

D_n
- Chen and Koh, 1992. Interestingly, they use the notation D(n,r,k) to denote the number of r-permutations of N_n with k fixed points, and (good for them) cite Hanson, Seyffarth and Weston 1982 as the originators of this notation.
- Martin, 2001

- d_m
Goulden and Jackson, 1982.
-----------------------------------------------------------------------------------------
The Niven book is his well known Mathematics of Choice, and he uses the symbol D(n) . In 1997 Robert Dickau used\$D_n\$ for derangements, another common name for subfactorials.    John Baez used !n  in 2003 without indicating that it was an uncommon symbol.
The formula for subfactorial, also called derangements of a set, is given by \$!n = n!( 1- \frac{1}{1!} + \frac{1}{2!} - \frac{1}{3!}..... \frac{1}{n!} )\$,  The quick approximation is !n = n!/e.

Tuesday, 22 August 2023

Totients, Eulers Phi Function (Unlike Lightning, they always strike at least twice)

 


The totient of an integer, N, is the number of integers Less than N which are relatively prime to N, that is, they share no common factors. The symbol for the Totient (by the way, the word is pronounced to rhyme with "quotient"... I didn't know that for a long time) of N is usually the Greek letter Φ. We would write Φ(10)=4, to indicate there are four numbers less than 10 which have no factor in common with the number ten. The four numbers 1,3,7, and 9 are called the totitives of 10. The image at top shows a graph of Φ(n) for each n.
Euler showed that if a number n had prime factors p, q, and r; then the totient would equal N(1-1/p)(1-1/q)(1-1/r). It doesn't matter if it has some prime factors more than once, you only use each factor once in the calculation. As an example, 20 factors to 2x2x5, but the number of prime factors is found by 20 (1-1/2)(1-1/5) = 8; with totatives of 1, 3, 7, 9, 11, 13, 17, and 19. The word totient is drawn from the Latin root tot for "so much", and probably to the Greek tosos, "so great". The word tot is still used occasionally for a mark made beside a list to acknowledge receipt, and is sometimes called a "tot mark"(pronounced with a long o, like tote). Euler defined the rule for the number of totients around 1761 in proving what we now call the "Euler-Fermat" theorem. Euler didn't use the word totient. That term was introduced by J J Sylvester,  who had a habit of making up new words for math terms.( J. J. Sylvester (1879) "On certain ternary cubic-form equations," American Journal of Mathematics, 2 : 357–393; Sylvester coins the term "totient" on page 361: "(the so-called Φ function of any number I shall here and hereafter designate as its τ function and call its Totient)")

The name "PHI" for the function was created by Gauss in his Disquitiones arithmeticae .

Here is a list of the first few integers, their totients, and their totitives...

N_____Φ(N)______ totitives

1_____ 1 ____ 1

2_____ 1 ____ 1

3_____ 2 _____ 1,2

4_____ 2 _____ 1,3

5_____ 4 _____ 1,2,3,4

6_____ 2 ______1, 5

7_____ 6 ______1.2.3.4.5.6

8_____ 4 ______ 1,3,5,7


There is actually an interesting unproven math theorem about totients. It seems that any number that appears in the sequence of Φ(N) must appear at least twice. It has been proven that if there is an exception, it must have more than 10,000 digits. This is sometimes called the Carmichael Conjecture after R. D. Carmichael.

Tuesday, 15 August 2023

Fabian Franklin's Beautiful Proof of the Pentagonal Theorem

 

*Wik

On Aug 16, 1878 Charles Hermite wrote to J J Sylvester at Johns Hopkins concerned about his accepting a Math Chair in America and questioning the ability of the American people to contribute to research-level mathematics. Only three years later he would be reading the paper of Fabian Franklin, a young assistant mathematics instructor at Johns Hopkins, before the French Academy. The paper was on a short, purely graphic, proof of Euler's theorem on pentagonal numbers. Hans Rademacher called this proof “the first major achievement of American mathematics.”

Some background for students: Pentagonal numbers are named for the ways of arranging dots into pentagons, much like the square numbers or triangular numbers. The true or pure pentagonal numbers are 1, 5, 12, 22, 35, 51, 70, 92,...
*Wik




You can get them by using the formula \(  \frac{3n^2-n}{2} \) with n a positive integer.
But for what we are doing today, we need to also include the generalized pentagonal numbers. They are obtained from the formula given above, but with n taking values in the sequence 0, 1, −1, 2, −2, 3, −3, 4..., producing the sequence 0, 1, 2, 5, 7, 12, 15, 22, 26, 35,...

One of the amazing things about this sequence is that it shows up in relation to finding the sum of the divisors of n, and finding the number of partitions of n. As Euler used it for the Pentagonal Number theorem, it was written out as \( 1 − n − n^2 + n^5 + n^7 − n^{12} − n^{15} + n^{22} + n^{26} − n^{35} − etc\) Notice all these numbers are the same as the ones in the generalized pentagonal numbers, hence, the pentagonal number theorem.

All that is beautiful math, but today I focus on a detail of the theorem that led to the graphic proof. What the terms of the Pentagonal Number theorem really say, and a question about them. If we look, for instance, in the partitions of five, they are {5},{4,1}, {3,2}, {3,1,1}, {2,2,1}, {2,1,1,1,1}, and {1,1,1,1,1} These can be divided into two sets, can you figure out how some are different than the others? Look at the first three. Now look at the last four. Each of the last four have repeats of one or more numbers. The first three are all distinct. Of the three with distinct digits, two of them have an even number of integers in their composition, {4,1} and {3,2}. The other, {5}, has an odd number of integers. And if you look at the exponent of X5 in the theorem, you see that it is positive, and that's what the theorem really says. If you look at all the partitions of any number, this polynomial gives you the the number of even distinct partitions (an even number of integers in it) minus the number of odd distinct partitions. So 5 has one more even than odd, and 7 does as well, but 12 has one more odd than even. but what first aroused Franklin's curiosity, was why there were so many missing exponents, why there were so many like X3 and X4 and X6. These would all have an equal number of odd and even partitions, hence the terms with zero for a coefficient which simply did not appear. what would explain this?

Franklin's insight was that for numbers like 6, the numbers could be matched up into odd and even pairs that offset each other in the count. For example, the distinct partitions of 6 are {6}, {5,1}, {4,2}, {3,2,1} the other seven partitions of 6 all have a repeated value. In his plan, the first two were matched together, and the last two were converted to each other, and he even had a graphic plan to show it always would work.

Here are two partitions of the number 33. The first is a partition into {9,8,7,5,4} The right diagonal which has 3 dots in it, and the bottom row which has 4 dots in it are the key. Since 3 is less than four (and four then, is the smallest number in the partition, we can move the 3 dots in the diagonal to make a new row in the bottom, and reduce the top three rows by one. So the matching partition is {8,7,6,5,4,3} at right. Note that we have changed the odd permutation into an even one. And we can go back by moving the three on the bottom row in the right partition to return to the left. These two always match. But he realized that there might be a situation in which this didn't work. For instance if the number of dots in the diagonal and the number of dots in the bottom row are the same (they share a corner dot) then you couldn't move either one. This can only happen if the bottom row is equal to the diagonal, or if the diagonal is one more than the bottom row. Here are examples of numbers that can't be matched to another. The top row is made up of numbers that have them equal. If you try to shift either one to make and odd partition even, or vice versa it just won't work. And the bottom sets show numbers that can be arranged with a partition that has the lowest row one more than the diagonal. They won't work either.

Now look at these numbers, count the dots, what do you notice. These are all the numbers in the Pentagonal Theorem Polynomial. And try as you may, you can't find another partition of any of these numbers that can't be transformed from odd to even or even to odd. If this partition has an odd number of rows, then the coefficient of that power in the polynomial is positive (5 in top row and 7 in bottom row are both positive coefficients since there is one odd partition that can't be matched to this even partition. The distinct partitions of 7 are {7}, {6,1}. {5,2}, {4,3} and {4,2,1} . Draw the diagrams, 7 can be transformed to {6,1} by dropping the last dot (a diagonal of one) to be a second row. {5,2} and be transformed in the same way to make {4,2,1} but the {4,3} has no match, so 3 evens, 2 odds makes the coefficient one.

I had never seen this before until I read a paper "The Pentagonal Number Theorem and All That" by Dick Koch from 2016. Here is the link, with thanks to John Golden@mathhombre

Sunday, 13 August 2023

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 and umbra versa. Viète used the terms amsinus and prosinus. The name tangent was first used by Thomas Fincke in 1583. 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.

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.

Thursday, 10 August 2023

Those Amazing Boole Girls

 

From left to right, from top to bottom: Margaret Taylor, Ethel L. Voynich, Alicia Boole Stott, Lucy E. Boole, Mary E. Hinton, Julian Taylor, Mary Stott, Mary Everest Boole, George Hinton, Geoffrey Ingram Taylor, Leonard Stott.

As it happens, it was on Ada Lovelace Day, "an international celebration of the achievements of women in science, technology, engineering and maths" that I first decided I need to know more, and write about the daughters of George and Mary Everest Boole. I was reading Sibohan Robert's, The King of Infinity, about Donald Coxeter (A very entertaining book).
While he was a student of H F Baker at Trinity, Cambridge they attended "tea parties"; tea, biscuits (cookies for US folks), and lots of geometry at Baker's home. When his time to discuss his research cam, the 21 year old Coxeter introduced his "Aunt Alice", the 68 year old Alicia Boole Stott, to deliver a joint lecture. I had read about Mary E. Boole, and knew a little about her relationship with Hinton (more later) and her teaching and string art and.... Ok, I had a lot of the Gossip, with very little detail. Since it was Ada Lovelace Day, I decided to remind myself, and some of my readers who had not known about them well, to Mary and her daughters, mostly all raised after George Boole had died (Alicia, the middle daughter was four years old, and her baby sister Ethel was only six months). Some of what follows is from notes I have accumulated over the years, and some is from recent searching. If you have access to information about the family not included here, especially about Margaret, I would love to have you share.

Ok, So maybe this event might have happened a little later than Professor Coxeter remembers in his book to Ms. Roberts. It more likely was when Donald was 23 and Alicia was 69/70 since according to most sources she was introduced to young Donald in 1930 by the Cambridge physicist, Geoffrey Ingram Taylor. This Taylor just happened to be Alicia's nephew, the son of her second oldest sister, Margaret. Get used to this, it seems that everyone in the UK is related to everyone else, or at least it seems that way in this exploration.

So let's start with the Mom, Mary Everest Boole (the Everest??? Her uncle was the one for whom they renamed the mountain). Mary got her introduction to mathematics in France where her father had gone to try and cure his health using homeopathic methods. (In fact it seems he was staying at the home of Christian Friedrich Samuel Hahnemann, who is credited with inventing homeopathic medicine. The Reverend Everest was a strong believer in homeopathy, and is said to have preached it from the pulpit. He published A Letter addressed to the Medical Practitioners of Great Britain on the Subject of Homeopathy, 1834, Pickering, London, A Popular View of Homeopathy .)
From about age 11, she used her father's library to teach herself math as she no longer attended school. She met George while visiting relatives in Ireland. Boole had only recently been appointed as the first professor of mathematics at Queen's College, Cork in Ireland. He met his future wife, Mary Everest, there in 1850 while she was visiting her uncle John Ryall who was Professor of Greek in the university. (Boole would write a dedication in his "Laws of Thought" to Ryall. )

After she returned to England, they continued to correspond until he came to England to be her tutor during a break from his University duties. About this time, her father died and presently Mary and George were married. During this time he wrote Laws of Thought, and Mary was instrumental in the editing.
It seems she had not been George's first love. In a letter from Ethel Lilian Voynich, the youngest daughter, to her nephew, the previously mentioned G I Taylor on 9 May 1954. she relates a story of the Parry family of Lincoln, a daughter of which Boole is reputed to have fallen in love with in his youth, and never got over until he met Mary Everest. The Miss Parry ahd refused to marry him as he would not sign the 39 Articles of the Church of England (more later on George's strong and unconventional religious leanings). By some accounts, there may have been several infatuations of various levels for young George. In Desmond MacHale's biography, The Live and Work of George Boole, he writes, "Boole... was a romantic at heart and fell in and out of love quite easily. ...a pupil of Boole's both in Lincoln and in Cork, wrote in a letter to his parents, 'Mr Boole is reported to have lost his heart again."

After a brief, but apparently happy nine years of married life, George died leaving Mary with five young girls all less than age ten. The details of George's unusual death are in some part related to Mary's father's influence and their mutual attraction to homeopathic medicine. One day in 1864, George walked three miles in the drenching rain and lectured wearing wet clothes. He soon became ill, developing a severe cold and high fever. His wife felt that a remedy should resemble the cause. She put George to bed and threw buckets of cold water over him (cold water and ice baths were a common part of homeopathic treatment at the time), since his illness had been caused by getting cold and wet. George Boole's condition worsened and on 8 December 1864, Boole died of an attack of fever, ending in pleural effusion.
In the earlier mentioned letter from Ellen Boole Voynich to G. I. Taylor she also includes that a bitter rivalry had existed between her mother and her aunt Maryann Boole (This most likely refers to George's sister, Mary Ann, the same as her mother.) as Maryann believed Mary E. Boole hastened her husband's death by following the recommendations of a doctor who advocated cold water cures, and making Boole lie shivering between the sheets. Ethel remarks "The Everests do seem to have been a family of crooks and cranks."
It should be pointed out that George was also a follower of homeopathic practices, but perhaps with a little less enthusiasm than his wife. In a letter to Augustus DeMorgan on 17 July, 1860 he writes, "The moral is - if you are ever attacked with inflammation and homeopathy does not produce decided effects soon, do not sacrifice you life to an opinion...but call in some accredited... Esculapius (Aesculapius was the Latin god of medicine, son of Apollo and Coronis. The first temple, with a sanatorium, was erected to him in Rome in 293) with all his weapons of war and do as your ancestors did - submit to being killed or cured according to the rule." In the mid 19th century, homeopathic followers were not all "crooks and cranks. DeMorgan believed he had been cured by homeopathy, and was a follower as well.

After George Boole died, Mary returned to London with four of the five children, Alicia stayed for about seven years with family in Cork.

Although one frequently reads that they were essentially impoverished, (Coxeter writes,... "the five girls were reunited with their mother (whose books reveal her as one of the pioneers of modern pedagogy) in a poor, dark, dirty, and uncomfortable lodging in London."   ) It seems this might well have exaggerated the case. After a London newspaper, reporting on Boole's death, suggested that the Boole family had been left unprovided for, donations poured in from their friends in London and around the UK. That the "unprovided for" seems not to have been the case is attested to by a letter (3 Feb 1865) from Isaac Todhunter of St. John's College Cambridge. He apologizes for any upset caused and states the subscriptions were refunded.

Mary took a job as a librarian at Queens College, probably through her knowledge of Reverend F. D. Maurice, who was one of several religious reformers with unconventional views that George admired. George had strong disagreements with many authoritarian views of religion, but never wrote on these ideas himself, although he was openly a supporter of several others, including Maurice, and John W. Colenso, the Bishop of Natal ( Colenso was a better than average mathematician himself, having been Second Wrangler and a Smith's Prize winner, and had taught at Harrow School as mathematical tutor for awhile and was the author of a popular arithmetic.).
Maurice was also one of the founders of Queens College, which was  England's first women's college. Working with the students there she, and others around her, realized that she was an exceptional teacher. It was during this time that she created the idea of "string art" for teaching students about mathematical and geometric ideas. Many years later the art form would become very popular in the US. Her approach to teaching would fit very neatly among many reform minded educators of the last thirty years. She once wrote, "The geometric education may begin as soon as the child’s hands can grasp objects. Let him have, among his toys, the five regular solids and a cut cone."  She also suggested that no child should be given a multiplication table until they have produced one on their own.

"She wrote several books which were published much later but she certainly had the ideas for them when unofficially tutoring at Queen's College. Examples of these books are (i) Logic Taught By Love (1890), (ii) Lectures on the Logic of Arithmetic (1903), (iii) The preparation of the child for science (1904), and (iv) Philosophy and the fun of algebra (1909).  " (St Andrews History of Math web site)
Her "Philosophy and the fun of algebra" is available, read aloud. [This link appeared to have changed, will pursue reconstruction]The introduction alone is worth the visit. 
Mary was interested in spiritualism and as a result of a book she wrote caused her to lose her library job. She found employment with a friend of her father, the surgeon, spiritualist and reformer, James Hinton. He was also, according to his son, a radical advocate of polygamous relationships.
"James Hinton’s writing, focused on domestic life, was outside of mainstream philosophical and cultural thought, and radical in its avocation of polygamous relationships, freer relations between the sexes, and the benefits of female nudity." (M J Blackloc, A cultural history of higher space, 1869-1909)

In 1880, Mary's oldest daughter, Mary Ellen, married James Hinton's son, another unusual character, named Charles Howard Hinton. I have written about Hinton's unusual life and some notable achievements here. His book on the fourth dimension was influential on Coxeter, and he was known to work with the three younger children during his courtship by showing them colored blocks he had made for studying 4-D. This would seem to have a special effect on the middle daughter, Alica. Hinton was Science Master at Uppingham School in the early 1880's at the same time that the Maths Master there was Abbott's friend Howard Candler, the "H.C." to whom Flatland was dedicated.

Hinton created several new words to describe elements in the fourth dimension. According to OED, he first used the word tesseract in 1888 in his book A New Era of Thought. He also invented the words "kata" (from the Greek "down from") and "ana" (from the Greek "up toward") to describe the two opposing fourth-dimensional directions—the 4-D equivalents of left and right, forwards and backwards, and up and down.  


In the 80's Mary Ellen traveled with Hinton to Japan. Her long letters [1888 - 1891] back to her family indicate she was teaching school there (she mentions giving her students essays on the customs of Japan so that she can learn about them, as Yokohama is very westernized). They traveled frequently, and she speaks often of the beauty of the country. She makes no mention of her own writing, or of C. H. Hinton's work there.

Then around 1893 Hinton has a job as a professor in Princeton. It was here that he invented the gunpowder charged pitching machine that would. with modifications for safety, find its way into baseball forever. The machine was featured in an article in Harper's Weekly, for March 20, 1897. He apparently was quite popular with students, who nicknamed him "bull", supposedly for his great strength. After a Pennsylvania-Princeton football game, Prof. Hinton became the hero of the students by physically throwing a large Pennsylvania supporter over a fence after the man had attempted to snatch a yellow chrysanthemum from Hinton's Coat.
For whatever reason, he left for a position as Assistant Professor at the University of Minnesota, where he seemed to stay only a short time. In 1900 he resigned the university and went to work at the Naval Observatory in Washington, D.C. Simon Newcomb, recently retired, was still active in direction of the affairs of the observatory, and had also written on the fourth dimension, so he may have been essential in Hinton's new position there. Hinton would also have an unusual death.

Hinton suffered a cerebral hemorrhage and dropped dead on the spot while leaving the annual banquet of the Washington, D.C., Society of Philanthropic Inquiry. He was a prominent member of the Society and had wound up the evening by complying with the toastmaster's request for a toast to "female philosophers." His death is described in an article called "Scientist Drops Dead" in the Washington Post of Wednesday, May 1,1907.
(Rudy Rucker's introduction to Speculations on the Fourth Dimension: Selected Writings  of Charles H. Hinton,)

Mary Ellen would take her own life the following year. She was found dead of asphyxiation in her home on May 28 of 1908. The short article in the New York Times described her as "a frequent contributor to English and American Magazines." The article also quoted her as having recently written that, "life is something we have the privilege of ending when we choose. When think it is time to die, I shall end it all." There is a book of poetry, Other Notes by Mary Boole Hinton, published in 1901 that I take to be hers.


Margaret, the second of the girls would marry the artist Edward Ingram Taylor, and give birth to the Geoffrey Taylor mentioned earlier and a second son, Julian. One of Edward Taylor's works, titled Lambert Castle, is in the Fitzwilliam Museum, in Cambridge, but It seems that his real source of income was designing decorations for cruise lines. I am more partial to this charcoal sketch of his son at about age three.

Geoffrey was a major figure in fluid dynamics and wave theory. His biographer and one-time student, George Batchelor, described him as "one of the most notable scientists of this (the 20th) century". In 1944 he would be knighted, and awarded the Copley Medal from the Royal Society.
Son Julian was an accomplished surgeon. He also would distinguish himself during World War II when he volunteered, at the age of fifty. Shortly after his arrival there, Malaya and Singapore were overwhelmed by the Japanese and he was taken prisoner. After an interval an order was issued that all senior officers were to be transferred to camps in Formosa but, following universal request and pressure, Julian Taylor was permitted to remain in Changi Prison with the others, where for the next three and a half years he carried out remarkable work, not only in the field of surgery working with negligible facilities but, even more, in the field of morale by his inspiration to men much younger than himself. With his wide range of knowledge and experience he could lecture on English history, French history, the City of London, the tides round the English Coasts and the sailing of small boats, thus relieving the tedium and hopelessness of the situation. He was awarded the CBE for this service. Margaret, seems to be the most difficult of the five sisters to find information about. Perhaps she simply chose to be the wife and mother who would raise incredible children.  Perhaps she had a life full of richness that many people have who lead quiet lives.  Perhaps both of these are true. 

Alicia Boole, the "Aunt Alice" mentioned in the beginnings of this blog, was surely the most mathematical of these unusual women.  Her only education was from her mother, but given that Mary E. had proven herself an outstanding teacher, perhaps her mothers use of models prepared her for the incredible capacity she would have to visualize higher dimensions.  By whatever means, when Charles Hinton walked in to visit the home and pulled out his colored blocks of the 3D projections of four dimensional solids, Alicia was enthralled.  She quickly outpaced her brother-in-law. During this time she was only 17, and developed the ability to visualize in a fourth dimension.
She found that there were exactly six regular polytopes in four dimensions and developed the term polytope. She also produced three-dimensional central cross-sections of all the six regular polytopes by purely Euclidean constructions and synthetic methods and made cardboard models of all these sections. Later she was a contributor to his book. For Hinton's, A new era of thought published in 1888, (in which he introduces the term tesseract) Alicia Boole wrote part of the chapters on sections of 3-dimensional solids.
After her sister and brother-in-law departed England for Japan, she took a job as a secretary in Liverpool where she would meet and marry her husband, the actuary, Walter Stott the following year. She had two children in the first two years of marriage, and little time it would seem to talk about the fourth dimension, but she or her husband noticed an appeal by the Dutch mathematician Schoute for the solution to the other half of some four-dimensional geometry program he had partially resolved. Alice had the other half in the models she had made.


Schoute and Alicia Boole Stott

Schoute came thereafter each summer, and they continued to work together. Schout persuaded her to publish her results which she did in two papers published in Amsterdam in 1900 and 1910.

At the tercentenary of the University of Groningen, they made a big deal about the collaboration and the models, and they sent back to Alice a fancy scroll, in Latin, which she couldn't read. Later her son read it and exclaimed, "Jesus Christ, they're making you a Doctor."  (This story seems almost unbelievable as arrangements had been made for Alicia to stay with Schoute's widow.  It is hard to imagine that she was unaware of the reason for her visit, but she lived in a world of hard to imagine things, so I include the story.)
Leonard would have been about 23 years old by this time and may have been very fluent in Latin. He went on to be a doctor of merit, "a pioneer in the treatment of tuberculosis, and invented a portable x-ray machine." (Vita Mathematica: Historical Research and Integration with Teaching edited by Ronald Calinger) For his 30 plus years at the Papworth Village settlement which was tried to provide a "normal" life to sufferers of tuberculosis allowing them to be with their families, have and raise children, etc. Fears for the young death of children born into such an environment proved unfounded. For his service to the country he was awarded the OBE.

Using the special capacity of her mind, she developed a new method to visualize four-dimensional polytopes. In particular, she constructed the three-dimensional sections of these four-dimensional objects. The result is a series of three-dimensional polyhedra, which she illustrated making drawings and three-dimensional models. The presence of an extensive collection in the University of Groningen (The Netherlands) reveals a collaboration between Boole Stott and the Groningen professor of geometry P. H. Schoute. This collaboration lasted more than 20 years and combined Schoute’s analytical methods with Boole Stott unusual ability to visualize the fourth dimension. After Schoute’s death (1913), the University of Groningen in 1914 awarded an honorary doctorate to Boole Stott.


For whatever reason, Alicia did not make the trip to Groningen and the award was made in her absence.
After that she seemed to quit working on her polytopes for a period of about 15 years, then the introduction to Coxeter gave renewed life to her work and they corresponded and visited until he left for Canada in 1936. She would die four short years later.
For people who imagine that all mathematicians have some special knack for seeing the fourth dimension, a story that may illustrate somewhat how profound was Alicia's talent. One of the great (some say greatest) geometers alive today is John H Conway.  He told this story to Siobhan Roberts during a conference in Japan :

while he was at Cambridge circa 1960, he made an earnest attempt to think in four dimensions.  Being a geometer, Conway naturally preferred contemplating a fourth dimension in terms of space.  In attempting to visualize a fourth coordinate or dimension in space, Conway built a device that allowed him to see with what he called “double parallax” ─ in addition to the displacement that occurs horizontally when you look at an object by closing one eye and then the other, he tried to train himself to see vertical parallax. If he could experience both horizontal and vertical parallax, he would have four coordinates for every point in space, and thus would be seeing four dimensions. In his attempt to do so, Conway donned a recycled motorcycle helmet, adapted with a flat visor and cheap, old war- surplus periscopes. The periscopes were bolted to the visor (not very well; they rattled when he walked) and extended from his right eye up to his forehead and his left eye down toward his chin. The only name Conway had for the helmet was“that damned contraption”because it was rather uncomfortable, his nose pressed up against the visor, as a child’ s to a toy shop window at Christmas.  Conway had a strong desire to see four dimensions, which he truly believed was possible (Conway died in 2020, perhaps he now can see in much higher dimensions). He regularly walked around wearing his helmet in the Fellows Garden of his college at Cambridge, and in a flash of daring (or stupidity) during one Saturday in the downtown streets busy with shoppers.“I suppose I had a limited amount of success in that quixotic quest,”he told me.“I got to the point where I could see four dimensions, but there was no hope of going beyond, so what’ s the point?





Lucy Everest Boole, sister number four, was an Irish chemist and pharmacist and professor at the London School of Medicine for Women. She was the first female Fellow of the Royal Institute of Chemistry. Lucy Boole never married and lived with her mother. She became ill in 1897 and died in 1904 at the age of 42.

In 1902 Ethel Lilian Boole, the youngest of the girls, married Wilfrid Michael Voynich, a Polish revolutionary, antiquarian, and bibliophile, the eponym of the Voynich manuscript (I first learned of the Voynich manuscript in exploring Belphagor's Prime, the number 100000000000000666000000000000001. This beautiful palindromic prime has a 1 at each end, with 666, the number of the beast in the middle, and thirteen ones on each side separating the 666 from the units. The symbol even had its own symbol, a sort of inverted π. The symbol itself comes from the Voynich Manuscript.) She is most famous for her novel The Gadfly, first published in 1897 in the United States (June) and Britain (September), about the struggles of an international revolutionary in Italy. This novel was very popular in the Soviet Union and was the top bestseller and compulsory reading there, and was seen as ideologically useful; for similar reasons, the novel has been popular in the People's Republic of China as well. By the time of Voynich's death The Gadfly had sold an estimated 2,500,000 copies in the Soviet Union and was made into a movie in 1928 in Soviet Georgia (Krazana) and in 1955. (At the time I am writing this, the book is available in Kindle edition for free. The mysterious Voynich Manuscript, was \($4.99 \)US) 

In 1955, the Soviet director Aleksandr Fajntsimmer adapted the novel into a film of the same title (Russian: Ovod). Composer Dmitri Shostakovich wrote the score (see The Gadfly Suite, like everything else in the universe, it's on Youtube). Along with some other excerpts, the Romance movement has since become very popular. Shostakovich's Gadfly theme was also used in the 1980s, in the BBC TV series Reilly, Ace of Spies. In 1980 the novel was adapted again as a TV miniseries The Gadfly, featuring Sergei Bondarchuk as Father Montanelli.

I mentioned Geoffrey Taylor, the physicist son of Margaret.  Mary Ellen's two sons distinguished themselves as well. George Hinton worked as a metallurgist in Mexico, and  made extensive classifications of the flora and fauna of central and southern Mexico with his son.  His collections included well in excess of 300 new species and four new genera. His son, Howard Everest, extended the education provided in the fields by his father to become one of Englands entemologists, and perhaps the worlds foremost expert on Dryopoidea, (a taxonomic superfamily of beetles).
Sebastian Hinton, a Chicago Lawyer (the firm had the Wrigley's Gum acct) is credited with the invention of that school yard staple, the Jungle Jim. He hit on an idea of bringing his father's work somewhat into the hands of the public-at-large--specifically, into the hands of children, who would be able to play and climb and swing in Charles' fourth dimensional idea.  He applied for a patent in 1920 which was granted in 1923."


"Evidently the term "monkey bars" didn't take hold until the 1950's, though Hinton referred to "monkey-like play" in his patent application. Also Charles had built a version of these of bamboo for the children to play on and help them understand the concept of moving through three (four) dimensional space.  " *JF Ptak Science Books 

Sebastiane married Carmelita Chase who founded the Putney School in Vermont and   who was a personal friend, it seems, of Chairman Mao.  Sebastian seemed to have lived much of his adult life fearing that he was genetically predisposed to suicide because of his mother.  In 1923 he checked into a clinic for treatment, but while there committed suicide. After his suicide, thirty-three-year-old Carmelita was a single parent raising three young children. Jean was six, William four, and Joan not quite two. Fortunately, Carmelita was not without financial resources. One of them was the just approved Jungle Gym patent.

Their daughter, Joan Hinton,was a physics graduate student at the University of Wisconsin when she was tapped for Los Alamos. She worked on a team building the first reactor able to use enriched uranium as fuel. Hinton also witnessed the Trinity Test. She was one of only one or two woman taking part in Manhattan Project developing the A-bomb, in 1948.  Shortly afterward she went to China to join the revolution and ran a dairy farm near Beijing. She would die there on June 8, 2010.  Her brother, William,is best known for his book Fanshen, published in 1966, a "documentary of revolution" which chronicled the land reform program of the Communist Party of China (CPC) in the 1940s in Zhangzhuangcun.  

The other daughter, Jean was a life long environmentalist and activist.  She once said,

".. her mission in life became clear to her one day in 1941, when she helped a group of black activists storm a whites-only cafeteria in Washington, D.C."

An interesting tie between members of the family also occurred at the first atomic bomb explosion at White Sands, N.M. Working on the project, it would be expected that Mary Ellen's granddaughter Joan would be there, but it appears she only got to witness it by avoiding cars with a friend on a wild motorcycle ride into the hills about 25 miles away. Geoffrey Taylor's work in in turbulent motion and shock waves allowed him to contribute to problems that they were having with the implosion instability needed to trigger the chain reaction. To this end he visited the US in 1944, and again in 1945 to be at the same Bomb Blast. 

Joan Hinton had a son with her husband, Erwin Engst, an American (Cornell trained) dairy farmer, and together they started dairy farms in Xi'an and Beijing.  Their son Fred Engst is a  professor of Economics at the University of International Business and Economics  in Beijing.
William Hinton's daughter, Carma, also has distinguished herself.  She was born in Beijing in 1949 and stayed until 1971.  She is most famous for her documentary (co-produced with her husband Richard Gordon) “Gate of Heavenly Peace” of the 1989 Tiananmen Square protests.
And the family has yet another social activist in a newer generation.  Gina Engst , granddaughter of Joan Hinton, is a graduate of the Putney School created by great-grandmother, and is now based in Spain, where, by some estimates, the latest housing bubble left some 8 million housing units (new and old) unoccupied. Gina is part of a group helping older people squat. The group also helped turn one of the mansions in Barcelona into a community center for Latin American immigrant workers.


Well that's it, the state of my knowledge to date on the incredible daughters of George and Mary E. Boole.  I hope to keep updating this as good people with more information than I have share their knowledge with me.  So check back and see what I have learned, corrected, etc.  My thanks to many people who gave me leads to resources on the internet and off.  A 20 year old communication between Prof. Thomas Banchoff of Brown University and Rudy Rucker, author and (to my last knowlege)  webzine editor was especially fruitful, and a personal letter from Prof Banchoff pointed me to some more recent information on the descendents of Joan Hinton.  I have also taken liberally from a blog at A New Yorker in  Beijing .