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Convergence articles

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A survey of early theories of planetary motion, with dynamic figures to help in understanding these motions.
A small selection of Euler's works, explained by a master expositor.

Curve sketching, tangent lines, and optimization, explored via interactive applets

NCTM Annual Meeting in St. Louis
Page 5 of Paul Halmos Photograph Collection: Paul Bateman, Felice Bateman, Edward Begle, Alexandra Bellow, William Johnson, Georgia Benkart, Lipman Bers
A description of this well-regarded website.
In this article which won the 2005 prize of HOMSIGMAA, the author discusses Eratosthenes' argument to determine the size of the earth as well as possibilities for the size which Eratosthenes found (in modern measures).
A general formed his men into a square, that is, an equal number in rank and file, and he found that he had an excess of 59 men.
This is the title page of the geometry book of Jacob Kobel (1460 - 1533). The book dealt primarily with measurement, showing its readers how to use various instruments to measure fields, determine heights of buildings, and perform various other necessary tasks.
The sum of two numbers is 10 and their product is 40. What are the numbers?

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