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Convergence articles

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A square walled city of unknown dimensions has four gates, one at the center of each side.
In the figure at the left, if the radii of each inscribed circle is 1, what are the dimensions of the bounding rectangle?
If 80 dollars worth of provisions will serve 20 men for 25 days, what number of men will the same amount of provisions serve for 10 days?
A fish sees a heron looking at him from across a pool, so he quickly swims towards the south. When he reaches the south side of the pool, he has the unwelcome surprise of meeting the heron.
Essays on various aspects of Greek science and mathematics, which help give a context for those aspects of Greek culture.
A wide-ranging site with links to many sources in the history of mathematics.
A lively description of ten of the greatest feuds in mathematics.

[Translation of title: Algebra in the Time of Babylon. When Mathematics Were Written on Clay.] A thorough review of Jens Hoyrup's revision, expansion, and French translation of his own 1998 book for Danish high-school students.

This website offers a collection of biographies of mathematicians and a variety of resources on the development of various branches of mathematics. It is an extremely rich and extensive site.
The Tree of Proportions and Proportionality from the De Divina Proportione of Luca Pacioli published in 1509.