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Dear Professor Greitzer

A letter to Sam Greitzer, late editor of Arbelos, discussing the derivation of two formulas for calculating pi.

Classics of Mathematics

A sourcebook of original materials in the history of mathematics from ancient times to the early twentieth century.

How to Submit an Article to Loci

A brief outline of policies for submission of articles to Loci.

Pascal's Arithmetical Triangle

A history of the development of Pascal's triangle in its various manifestations

Pair of Numbers

There are two numbers whose sum equals the difference of their squares.

A Snake in the Hole

A powerful, unvanquished, excellent black snake, 32 hastas in length, enters into a hole at the rate of 7 1/2 angulas in 5/14 of a day, and in the course of 1/4 of a day its tail grows 2 3/4 of an angula.

God Created the Integers: Mathematical Breakthroughs that Changed History

Original source material from seventeen mathematicians, with commentary by Stephen Hawking.

A River Runs Through It

Wanting to know the breadth of a river, I measured a base of 500 yards in a straight line close by one side of it.

Surveying a Field

I was employed to survey a field, which I was told was an exact geometrical square, but by reason of a river running through it, I can only obtain partial measurements.

Johannes Kepler's Astronomia Nova

Three images from Kepler's 1609 Astronomia Nova, the text in which he introduced his first two laws of planetary motion