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History and philosophy of mathematics, biographies of mathematicians, mathematics education, recreational mathematics, communication of mathematics.

117 votes

Tweetable Mathematics

The sentence "The first positive integer that cannot be specified in a 140 character tweet" doesn't specify a well defined integer.
13 votes

Rediscovery of lost mathematics

The Tonelli–Shanks algorithm for finding square roots modulo a prime number. Today this is well known, it is e.g. used in the quadratic sieve method to factor large numbers. Alberto Tonelli discovered …