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Europeans Prior To Pascal Who Knew About The Triangle

            Blaise Pascal was not the first man in Europe to study the binomial coefficients, and never claimed to be such; indeed, both Blaise Pascal and his father Etienne had been in correspondence with Father Marin Mersenne, who published a book with a table of binomial coefficients in 1636.  Many authors discussed the ideas with respect to expansions of binomials, answers to combinatorial problems and figurate numbers, numbers relating to figures such as triangles, squares, tetrahedra and pyramids.

            Here is a short list in chronolgical order of publishing.

Ancient Greek Era

        Until recently, little had been known of the Greeks interest in combinatorics; it was known that they studied square numbers and triangular numbers, the second column of the Triangle, , so they knew that the sum of two consecutive triangular numbers forms a square, which is in our identity database as #1200002.  

        Recently a lost manuscript of Archimedes was rediscovered in a palimpsest, a text written over another older text.  Archimedes' work was bleached out and the parchment was cut to make paper for a prayerbook about 1000 years ago.  Using modern techniques, the work Archimedes did was restored, and it was shown he had correctly figured out the number of different ways a geometric puzzle called the Stomachion could be reassembled into a square; while Archimedes does not use the binomial coefficients, it does show an interest in counting previously unseen in surving texts from the classical Greek period.


The First Millenium (from 0 to 1000 A.D.)

Circa 100 A.D.:  Two authors, Theon of Smyrna and Nicomachus of Gerasa, saw that the sum of triangles could be seen as a tetrahedron, so the tetrahedral numbers, the third column of the Triangle, , were first seen in the West.  To generalize this concept for figures, the mathematicians of the day would have to think beyond three dimensions.  It would be over a millenium before another European would extend this work.

275:  Porphyry correctly lists the number of pairs of five voices is not 5×4=20, but ^5×4/₂=10.  His work is a commentary on Aristotle's Categories.

320:  Pappus of Alexandra generalizes Porphyry's work.

Circa 510:  Boethius, writing a commentary on Porphyry's work, repeats the generalization found by Pappus.

10th Century A.D.:  Sortes Apostolorum published, a book of fortune telling by dice rolls.  Similar publications, including 1484's Libro della Ventura are the impetus for Tartaglia solving the general problem of how many different dice rolls there are given k dice, each with n sides.

The Second Millenium (from 1000 A.D. until Pascal)

1140: In Spain, Rabbi Ben Ezra figures out the seventh row of the Triangle, in connection with the question of how to take the Sun and the six known planets (Mercury, Venus, Earth, Mars, Jupiter and Saturn) in combinations of one at a time, two at a time, etc.

1202: Fibonacci (also known as Leonardo of Pisa) writes down the expansion of (a+b)³, which was already well-known in India and the Middle East.  Besides being know for the Fibonacci numbers, he is also credited with being the first European mathematician to use the Hindu-Arabic numerals we use today, which made the Roman numeral system obsolete.

Circa 1225:  Jordanus of Nemore, a German mathematician, in his manuscript de Arithmetica shows that he understands both , the second of which is remarkable step forward for the mathematics of his day.  Jordanus dies young, lost at sea on the return trip from The Holy Land.

13th Century, exact date unknown:  In a poem entitled de Vetula, it is shown that three six-sided dice can come up in 56 different ways, if we count 6-6-5 to be the same as 6-5-6 and 5-6-6, for example.

1321:  Levi Ben Gerson, a Frenchman came up with the falling factorial formula for the binomial coefficients, and presents the first known examples of an explicit mathematical induction proof.  Both Ben Gerson and Ben Ezra were interested in the Hebrew mystical tradition of the Cabala, which has an interest in, among other things, seemingly magical relationships between numbers.

Circa 1407:  an edition of Jordanus' de Arithmetica contains the following table.

Note the somewhat strange obsolete versions of the numerals 4, 5, 6 and 7, while 0, 1, 2 and 3 are easily recognizable in their modern form.

1484: Lorenzo Spirto's Libro della Ventura (Book of Fortune) lists the 56 ways 3 six-sided dice can be thrown in nearly exactly the same way described in the poem de Vetula from two centuries before.  This is the inspiration for Tartaglia to solve the general problem for k dice, each with n sides in 1523, which is .

1523:  Nicolo Tartaglia first publishes the generalization of the figurate numbers.  Some 30 years later, in his General Treatise, he publishes the Triangle in table form.  Tartaglia is the first mathematician to publish a general formula for solving cubic equations.  His name in Italian means "stammerer".  This cruel nickname was given to him after severe facial wounds he suffered at the age of twelve when attacked by a soldier invading his hometown of Brescia nearly killed him; these wounds left him able to speak only with difficulty for the rest of his life.

1539:  Gerolamo Cardano, the Italian algebraist, correctly determines that the number of ways to take 2 or more things from a set of n things is 2ⁿ-n-1, which is the sum of the n^th row of the Triangle if we ignore the first two entries.

1544: The German mathematician Michael Stifel publishes the extended Figurate Triangle in the figure shown below.  Stifel gives credit to Cardano's work published five years earlier.

To turn this into Pascal's Triangle, we would need to add a column of 1's at the beginning, and then mirror the numbers listed on the left onto the right side, except for the rightmost entry in the even rows and the two rightmost entries in the odd rows.

1545: Scheubelius, another German, publishes his version of the Triangle in connection with the extraction of roots, the great unsolved problem of the age in its most general form.

Not as neat as Stifel's work a year earlier, and with the obvious errors of "41" and "51" at the end of rows 14 and 15 (there's also a "0" in row 10 that should be 120), Scheubelius' work does show that the Triangle is symmetric, which isn't clear in Stifel's representation.

1556:  Tartaglia publishes his General Treatise, which includes the following tables of the Triangle

The first page of Tartaglia's General Treatise, with the Triangle written in rectangular form

Also from Tartaglia, the Triangle in symmetric  form, with the 1's removed from both left and right

1570: Cardano publishes his Opus Novum (New Work), which includes the following page.

Cardano's 1570 work, which states the figurate numbers are the combinatorial numbers

1591:  François Viète gives names to the first few columns of the Triangle in Latin; "numeri trianguli", "pyramidales", "triangulo-trianguli", "triangulo-pyramidales"  These names are also used in the next century by Pierre de Fermat, who was Pascal's main correspondent in solving the Problem of Points, and William Oughtred, a British mathematician who influences many of his countrymen who come after him.

1631:  William Oughtred publishes his Clavis Mathematicae, which influences his student John Wallis and is later owned in a 3^rd edition printing ; both Wallis and Newton are instrumental in the work that connects the binomial coefficients to the new field of calculus later in this century.

1633:  The lifetime work of Henry Briggs entitled Trigonometria Britannica is published two years after his death by his friend Henry Gellibrand; he has a chapter on the figurate numbers, which he refers to as "the calcuator of many uses".

1636:  Father Marin Mersenne publishes his Harmonicorum Libri XII; Mersenne in his life meets with both Blaise Pascal and his father Etienne, and there is little doubt both of them read the book and saw this table.

While missing the first row of 1's, this table does correctly show that "36 choose 12", the number in the lowest right hand position, is over 1.2 trillion, a remarkable feat of patience for a person calculating all these numbers by hand.