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A survey of the attempts to prove Kepler's conjecture over the past 400 years.

This is from a letter of June, 1695 in which Leibniz is discussing differentiation with Johann Bernoulli. The work in which these letters appear is the Virorum Celeberr. Got. Gul. Leibnitii et Johann Bernoulli Commercium Philosophicum et Mathematica, originally published in 1740.

Frans van Schooten's Exercitationes mathematicae

This is page 167 from the Exercitationes mathematicae (1657) of Frans van Schooten (1615-1660). This book contained a collection of mathematical construction problems, among much else. It was one of the books read by Isaac Newton while he was a student at Cambridge University and helped to introduce him to modern mathematics. On this page we see a construction enabling one to find the distance across a river.

The Story of Mathematics

A wonderful survey of the history of mathematics, emphasizing its relationship with the ambient culture.

Dealing in Sheep

A man bought a number of sheep for $225; 10 of them having died, he sold 4/5 of the remainder for the same cost and received $150 for them. How many did he buy?

Mathematics Elsewhere

A compilation of ethnomathematical ideas from around the world.

Traveling on a Train

Two travelers, starting at the same time from the same point, travel in opposite directions round a circular railway.

Flying High

How high above the earth must a person be raised that he [or she] may see 1/3 of its surface?

Sides of a Rectangle 2

In a rectangle, given the diagonal and perimeter, find the sides

Mathematical Works Printed in the Americas, 1554-1700

A bibliographical reference to mathematics books printed in the new world before 1700.