Template:Today in Math History for May 13

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May 13, 1580 Ludolph van Ceulen asks the Delft town council to let him open a fencing school; the council grants his request.
May 13, 1750 Lorenzo Mascheroni is born in Bergamo.
May 13, 1791 Adrien-Marie Legendre is appointed to a committee of the Académie des Sciences that would eventually come up with the metric system.
May 13, 1984 Stanislaw Marcin Ulam dies in Santa Fe, New Mexico.
May 13, 2013 H. A. Helfgott submits a paper in which he claims to have proven the Goldbach conjecture for odd numbers as sums of three primes.

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