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Convergence articles

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Mathematical Treasure: Robert Tanner's A Mirror for Mathematiques

Images from a 16th-century text about the astrolabe and its uses

Historical Modules

A CD with eleven modules, each containing numerous activities designed to help secondary teachers use the history of mathematics to teach mathematics.

Napier's e

A discussion of why we use "e" to represent the base of the natural logarithm system.

Alien Encounters

A dramatization, in two Acts, of the struggles of European mathematicians of the seventeenth and eighteenth centuries to come to terms with the newly admitted negative numbers.

Leonardo da Vinci's Geometric Sketches

This is a collection of plates that Leonardo da Vinci created to illustrate De divina proportione of Luca Pacioli.

Traveling Men

Two men starting from the same point begin walking in different directions. Their rates of travel are in the ratio 7:3.

A Basket Case

Rabbits and pheasants are put in a basket.

Elephant Hunt

On an expedition to seize his enemy's elephants, a king marched 2 yojanas the first day.

Steamboat

The cost per hour of running a certain steamboat is proportional to the cube of its velocity in still water. At what speed should it be run to make a trip up stream against a four-mile current most economically?

The Classic Greek Ladder and Newton's Method

Greek ladders for approximating square roots may be more ancient than the ancient Greeks. Students at any level can appreciate their beauty and simplicity. Those who have studied calculus can compare them with Newton's Method for approximating roots.

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