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IOU

I owe a man the following notes: one of $800 due May 16; one of $660 due on July 1; one of $940 due September 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?

Going Through the Paces II

There is a four-sided field whose eastern side measures 35 paces, its western side 45 paces, its southern side 25 paces and its northern side 15 paces. Find the area of this field.

Indian Numbers Game

Find a number having remainder 29 when divided by 30 and remainder 3 when divided by 4.

Provisions

If 80 dollars worth of provisions will serve 20 men for 25 days, what number of men will the same amount of provisions serve for 10 days?

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

We invite you to send us information about these photographs of 20th century mathematicians.

Fibonacci's Liber Abaci

A translation of one of the earliest European mathematical texts to use the Hindu-Arabic number system.

Isaac Barrow's Geometrical Lectures

This is the title page to the English version of Isaac Barrow's Geometrical Lectures, which were originally given in his position as Lucasian Professor of Mathematics at Cambridge University. These lectures contain one of the earliest statements and proofs of what is today known as the fundamental theorem of calculus.

The Nothing That Is

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

The Mathematics of Egypt, Mesopotamia, China, India and Islam

A new collection of original source materials in the mathematics of five civilizations.

Student Reports: A Rewarding Undertaking

Some ideas on using student reports when you teach a course in the history of mathematics