Template:Today in Math History for April 18

Calendar of Today in Math History for April
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• April 18, 1756 Jacques Cassini dies in Thury.
• April 18, 1831 Sophie Germain writes a letter to Count Libri about the effect of the death of Joseph Fourier on Évariste Galois.
• April 18, 1907 Lars Valerian Ahlfors is born in Helsingfors (now Helsinki).
• April 18, 1955 Albert Einstein dies in Princeton, New Jersey.
• April 18, 1999 Gian-Carlo Rota dies in Cambridge, Massachusetts.