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

You have two sums of money, the difference of which is 2 dirhams; you divide the smaller sum by the larger and the quotient is equal to 1/2. What are the two sums of money?
On Triangles, by Regiomontanus (Johannes M�ller) (1436-1476), written in 1464 but not published until 1533.
There is a number which when divided by 2, or 3, or 4, or 5, or 6 always has a remainder of 1 and is truly divisible by 7. It is sought what is the number?
A discussion of aspects of Leonardo of Pisa's Book of Squares.
On an expedition to seize his enemy's elephants, a king marched 2 yojanas the first day.
A series of circles have their centers on an equilateral hyperbola and pass through its center. Show that their envelope is a lemniscate.
Given two circle tangent at the point P with parallel diameters AB, CD, prove that APD and BPC are straight lines.