Template:Today in Math History for April 12

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April 12, 1742 Christian Goldbach writes a letter to Leonhard Euler about an equation involving imaginary powers of 2 and apparently connecting them to Binet's formula for Fibonacci numbers.
April 12, 1749 Euler writes a letter to Goldbach proving a result concerning numbers that are the sum of two squares (see A001481).
April 12, 1782 Louis Antoine de Bouganville is court-martialled.
April 12, 1852 Ferdinand von Lindemann is born in Hannover, Hanover.
April 12, 1886 In a letter, Wilhelm Killing conjectures that the only simple algebras are those related to the special linear group and orthogonal groups (he will later realize he is wrong about this).
April 12, 1896 Ferdinand Frobenius writes the first of several letters to Richard Dedekind on the topic of group characters.
April 12, 1996 Arjen K. Lenstra announces the factorization of RSA-130 to the e-mail list NMBRTHRY.

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