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This is a collection of plates that Leonardo da Vinci created to illustrate De divina proportione of Luca Pacioli.
I found a stone but did not weigh it; after I added to it 1/7 of its weight and then 1/11 of this new weight, I weighed the total at 1 mina. What was the weight of the stone?
Now there are three sisters who leave home together.
A certain merchant increases the value of his estate by 1/3...

How a translation of Peano's counterexample to the 'theorem' that a zero Wronskian implies linear dependence can help your differential equations students

A set of n disjoint, congruent circles packs the surface of a sphere S so that each region of the surface exterior to the circles is bounded by arcs of three of the circles.
Title page from the Ars Magna, by Gerolamo Cardano, published in 1545. Engraved portrait of the author. First printed text of algebraic solution of cubic equations.
When knowing the sum of their ages along with another equation, determine how old a father and son are.
A history of the various algebraic structures that came together to give us "abstract algebra" by early in the twentieth century.
IOU
I owe a man the following notes: one of $800 due May 16; one of $660 due on July 1; one of $940 due Sept. 29. He wishes to exchange them for two notes of $1200 each and wants one to fall due June 1. When should the other be due?

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Dummy View - NOT TO BE DELETED