Template:Today in Math History for December 9

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December 9, 1741 Leonhard Euler writes a letter to Christian Goldbach stating that ${\frac {2^{i}+2^{-i}}{2}}\approx {\frac {10}{13}}$ (compare A219705 and A021017).
December 9, 1839 Gustav Roch is born in Dresden.
December 9, 1918 Haskell Curry leaves the Army.
December 9, 1955 Hermann Klaus Hugo Weyl dies in Zürich.

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