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This is a collection of plates that Leonardo da Vinci created to illustrate De divina proportione of Luca Pacioli.
A history of attempts to develop formulas expressing the sums of powers of the first n positive integers from the Pythagoreans to Jakob Bernoulli. With exercises.
One person possesses 7 asavas horses, another 9 hayas horses, and another 9 camels. Each gives two animals away, one to each of the others.
Now there are three sisters who leave home together.
I was employed to survey a field, which I was told was an exact geometrical square, but by reason of a river running through it, I can only obtain partial measurements.
X, Y and Z hired a pasture for the season for $90.00. Each has a different number of mules and are on the pasture for a different number of days. How much is each to pay?

Convergence Advisory Board 2004-2009

A history of the various algebraic structures that came together to give us "abstract algebra" by early in the twentieth century.

Images from Frans van Schooten's 1659 edition of The Geometry of Rene Descartes

A leech invited a slug for a lunch a leuca away.

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