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Convergence articles

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This is from a letter of June, 1695 in which Leibniz is discussing differentiation with Johann Bernoulli. The work in which these letters appear is the Virorum Celeberr. Got. Gul. Leibnitii et Johann Bernoulli Commercium Philosophicum et Mathematica, originally published in 1740.
Knowing the base, b, and the altitude, a, of a triangle. Find the expression for a side of the inscribed square.
There is a round town 8000 feet in circumference.
Website containing much information on mathematical symbolism and terminology, as well as portraits of mathematicians from postage stamps.
There is a round fish pond of certain dimensions, and into the pond is dropped a marble column. How high will the water rise?
A certain man says that he can weigh any amount from 1 to 40 pounds using only 4 weights. What size must they be?
A collection of articles dealing with mathematical models and objects and how they can be used in teaching.
This is a collection of plates that Leonardo da Vinci created to illustrate De divina proportione of Luca Pacioli.

A bibliographical reference to mathematics books printed in the new world before 1700.

A wonderful book about the square root of 2, beginning with the search for the side of a square double a given square.