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Convergence articles

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Arithmos seminars are 24-hour workshops on the classics of mathematics, read in the original, or in a scholarly English translation.
A collection of 24 mini-posters, each containing a quotation about mathematics.
Cantor's work on Fourier series provides historical motivation for the study of point-set topology.
Three congruent circles of radius 6 inches are mutually tangent to one another. Compute the area enclosed between them.
This is a page from a manuscript of the Algebra (Maqalah fi al-jabra wa-al muqabalah) of Omar Khayyam (1048-1131). This work is known for its solution of the various cases of the cubic equation by finding the intersections of appropriately chosen conic sections.
Two officers each have a company of men, the one has 40 less than the other.
The sum of the two digits of a 2-digit number is 9. If 45 is subtracted from the number, the result will be expressed by the digits in reverse order. Find the number.
An old Chinese general led his army to a river with a steep bank. Standing atop the bank, he held a stick 6 feet long perpendicular to himself.
There are two piles, one containing 9 gold coins, the other 11 silver coins.
Mathematics is often referred to today as the "science of patterns." But has this always been true historically, or is this something that happened in recent times? The question is discussed here with reference to the work of Euclid and Jacob Steiner.