Template:Today in Math History for April 30

Calendar of Today in Math History for April
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• April 30, 1777 Carl Friedrich Gauß is born in Brunswick.
• April 30, 1781 At the St. Petersburg Academy, Leonhard Euler explains a method for calculating Fresnel integrals using complex numbers.
• April 30, 1807 Gauß writes Sophie Germain ("Monsieur LeBlanc") a letter expressing his amazement at her true identity.
• April 30, 1914 Srinivasa Ramanujan moves into the Trinity College dorms.
• April 30, 1920 Ernst Steinitz takes up an appointment at Kiel.