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What will the diameter of a sphere be, when its volume and surface area are expressed by the same number?

The author became fascinated with the mysterious role of √-1 in electronics. Turning to history for insight, he brings the perspectives of both a practical man and a scholar in conveying the enchantment of mathematics for a non-mathematician.

From the Editors

Request from the editors.

To Infinity and Beyond

A cultural history of the infinite, from ancient to modern times, in which the author clarifies the conceptual underpinnings of this vast topic.

Review of L'algebre au temps de Babylone: Quand les mathematiques s'ecrivaient sur de l'argile

[Translation of title: Algebra in the Time of Babylon. When Mathematics Were Written on Clay.] A thorough review of Jens Hoyrup's revision, expansion, and French translation of his own 1998 book for Danish high-school students.

David Joyce's Website

This website contains a complete version of Euclid's Elements, with all the proofs.

Robert Recorde's Pathway to Knowledge

The first page of Pathway to Knowledge by Robert Recorde (1510-1558). A version of Euclid's Elements, with commentary by Recorde to make it easier to understand. This page includes Euclid's first three postulates.

The Right and Lawful Rood

The "rood", a linear measure dating from many centuries ago, is calculated anew in today's classrooms.

HPM Newsletter

The latest HPM Newsletter is now available here. Read it!

Mathematics Elsewhere

A compilation of ethnomathematical ideas from around the world.