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I owe a man the following notes: one of $800 due May 16; one of $660 due on July 1; one of $940 due Sept. 29. He wishes to exchange them for two notes of $1200 each and wants one to fall due June 1. When should the other be due?
Essays on how number has been critical to the work of scientists through the ages.

A collection of images of historical texts and tools to share with your students

A brief introduction to the life of John Napier, along with an animation of calculations using Napier's bones.
The classic work by Dirk Struik is still worth reading, especially for its attention to the social context of the development of mathematical ideas.
A delightful survey of the history of trigonometry, along with discussions of its uses, both ancient and modern.
A brief version of the author's well-known history of mathematics text.
As this biography reveals, Servois fought in battles for Paris and for the foundations of calculus.

A history of the concept of zero from as far back as the Babylonian period, with philosophical excursions into the meaning of "nothing".

Apollonius found how to draw normals to an ellipse from points in the ellipse by using hyperbolas. A modern version is presented here.