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Convergence articles

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A boy gives 11 coins of equal denomination to a man, and the man finds that their total value in yen is 4 less than his age.
Show that the curves x2 - y2 = a2 and 2 xy = b2 cross at right angles.
A number of 3 digits in base 7 has the same three digits...

We invite you to send us information about these photographs of 20th century mathematicians.

A study of Victorian idealism and its relation to religion, as exemplified in the work of three 19th century British mathematicians.
Two men have a certain amount of money. The first says to the second, "If you give me 5 denari, I will have 7 times what you have left."
Given: a circle with an inscribed equilateral triangle. The triangle has an area of 12 square units. What is the area of the circle?
On Triangles, by Regiomontanus (Johannes M�ller) (1436-1476), written in 1464 but not published until 1533.
What proportions of sugar at 8 cents, 10 cents and 14 cents per pound, will compose a mixture worth 12 cents per pound?

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