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Three vertical posts along a straight canal, each rising to the same height above the surface of the water. By using measurments of the posts, determine, to the nearest mile, the radius of the earth.

Pepper Importation

A merchant bought 50,000 pounds of pepper in Portugal for 10,000 scudi and paid a tax of 500 scudi.

Cat on a Hot Tin Wall

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

The Life of Numbers

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.

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