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Convergence articles

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Show that the curves x2 - y2 = a2 and 2 xy = b2 cross at right angles.
The third part of a necklace of pearls, broken in a lover's quarrel, fell to the ground...
A study of Victorian idealism and its relation to religion, as exemplified in the work of three 19th century British mathematicians.
A speculator bought stock at 25% below par and sold it at 20% above par. He gained $1560. How much did he invest?
Classrom suggestions for integrating Leonardo's ideas in several different classes
Two men starting from the same point begin walking in different directions. Their rates of travel are in the ratio 7:3.
A novel about Pythagoras and his followers

A collection of images of historical texts and tools to share with your students

A square walled city of unknown dimensions has four gates, one at the center of each side.
The beginnings of land measurement in the early United States and how this affected American democracy.