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Convergence articles

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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.
Short biographies of mathematicians with mathematical activities.
Arithmos seminars are 24-hour workshops on the classics of mathematics, read in the original, or in a scholarly English translation.
A new edition of a classic work on number theory.
Page 7, Who's That Mathematician: Images from the Paul R. Halmos Photograph Collection: Blackwell, Halmos, Boas, Bollobas, Bombieri, Mumford, Bonsall, Rankin
Information on previous ESUs
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.
A circle, a square and an equilateral triangle all have the same perimeter equal to 1 meter. Compare their areas.
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.
The number 50 is divided by a certain number. If the divisor is increased by 3, the quotient decreases by 3.75. What is the number?

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