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A set of four posters dealing with the Pythagorean Theorem, infinity, prime numbers, and the history of pi.

Find two numbers, x and y, such that their sum is 10 and x/y + y/x = 25

A reprint of the 32nd yearbook of the NCTM, dealing with developments in mathematics education in the U.S. and Canada. In particular, it gives a history of the various reform movements up to the publication date of 1980.

A Round Town

There is a round town 8000 feet in circumference.

The History of Mathematics: A Brief Course

A new edition of a brief history text, arranged topically rather than chronologically.

Mathematical Treasure: Ratdolt's Euclid's Elements

Images of the first printed edition of Euclid's Elements

Complexities: Women in Mathematics

A collection of articles about historical and contemporary women in mathematics.

Mathematics in Ancient Iraq: A Social History

A new history of mathematics in ancient Mesopotamia, concentrating on its social aspects.

Mathematics as the Science of Patterns

Mathematics is often referred to today as the "science of patterns." But has this always been true historically, or is this something that happened in recent times? The question is discussed here with reference to the work of Euclid and Jacob Steiner.

A Linear Hypocycloid

Prove geometrically that the hypocycloid is a straight line when the radius of the rolling circle is one-half the radius of the fixed circle.