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Convergence articles

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A speculator bought stock at 25% below par and sold it at 20% above par. He gained $1560. How much did he invest?
A collection of short biographical sketches of people involved in the development of calculus, as well as brief descriptions of important events in that development.
In a given square, inscribe 4 equal circles so that...
Arithmos seminars are 24-hour workshops on the classics of mathematics, read in the original, or in a scholarly English translation.
Find the isoceles triangle of smallest area that circumscribes a circle of radius 1.
Cantor's work on Fourier series provides historical motivation for the study of point-set topology.
A square walled city of unknown dimensions has four gates, one at the center of each side.
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.
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?
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.

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