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A cat sitting on a wall 4 cubits high saw a rat prowling 8 cubits from the foot of the wall.

A creative expression combining text, design and illustrations, originally designed for the International Congress of Mathematicians in Madrid.

Two Men Meet

A square walled city measures 10 li on each side. At the center of each side is a gate. Two persons start walking from the center of the city.

Compound Interest

Suppose a man had put out one cent at compound interest in 1620, what would have been the amount in 1824, allowing it to double once in 12 years?

Review of The Chinese Roots of Linear Algebra

An excellent and careful study of matrix methods for solving systems of linear equations in first century China.

Farmer's Best Deal

How many calves, goats and pigs did the farmer buy?

Ars Magna Title Page

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.

Al-Khwarizmi's Algebra

Page from al-Khwarizmi's algebra text written in about 825. The proof of the rule for solving a quadratic equation of the form "squares plus roots equal numbers".

Four Colors Suffice

The history of the four color problem with sketches of the attempted proofs in the nineteenth century and an outline of the computer proof of the twentieth century.

The Poincare Conjecture: In Search of the Shape of the Universe

The history of the Poincare conjecture up to its recent proof by Grigori Perelman.