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

Page 14: Erdos to Foias

A California miner has a spherical ball of gold, 2 inches in diameter, which he wants to exchange for spherical balls 1 inch in diameter. How many of the smaller spheres should he receive?

Niccolo Tartaglia's Nova Scientia

This is the title page of the Nova Scientia (1537) of Niccolo Tartaglia (1499-1557). In this work, Tartaglia discussed the mathematics of artillery and developed methods for determining the range of a cannon.

Mathematical Evolutions

A collection of articles from the American Mathematical Monthly by experts on the evolution of various fields of mathematics.

Bicyclists on a Track

Two bicyclists travel in opposite directions around a quarter-mile track and meet every 22 seconds. When they travel in the same direction on this track, the faster passes the slower once every 3 minutes and 40 seconds. Find the rate of each rider

Celebrating Women in Mathematics and Science

This unique and beautiful book features the biographies of twenty-two notable female mathematicians and scientists, showing how their determination, creativity, and intellectual passion helped them excel in their fields.

The Rat Race

Now there is a wall 5 feet thick and two rats tunnel from opposite sides.

The Quadrature of the Circle and Hippocrates' Lunes

A study of some elements of Greek geometry, as part of a course for liberal arts undergraduates on basic concepts of the calculus.

It's About Time

A great book from which to learn and teach the subject of relativity.

Euler's Gem: The Polyhedron Formula and the Birth of Topology

A sketch of the history of topology, beginning with the polyhedron formula, but continuing up to the present.