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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.

History of Mathematics Archive

A wide-ranging website with links to many sources in the history of mathematics.

Inscribed Square

Knowing the base, b, and the altitude, a, of a triangle, find the expression for a side of the inscribed square.

Who's That Mathematician? Images from the Paul R. Halmos Photograph Collection

Page 7, Who's That Mathematician: Images from the Paul R. Halmos Photograph Collection: Blackwell, Halmos, Boas, Bollobas, Bombieri, Mumford, Bonsall, Rankin

Musings of the Masters

Essays on various aspects of mathematical thought by prominent mathematicians of the past century.

Omar Khayyam's Algebra

This is a page from a manuscript of the Algebra (Maqalah fi al-jabra wa-al muqabalah) of Omar Khayyam (1048-1131). This work is known for its solution of the various cases of the cubic equation by finding the intersections of appropriately chosen conic sections.

Remarkable Mathematicians

A collection of biographies of sixty mathematicians from the eighteenth century to the twentieth.

Episodes in the History of Geometry through Models in Dynamic Geometry

Four episodes in the history of geometry are discussed, where dynamic geometry helps in understanding the ideas.

Circular Images

A Concise History of Mathematics

The classic work by Dirk Struik is still worth reading, especially for its attention to the social context of the development of mathematical ideas.