Template:Today in Math History for April 7

Calendar of Today in Math History for April
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• April 7, 1795 A law is passed in France making the metric system official, and putting Adrien-Marie Legendre in charge of managing the transition.
• April 7, 1889 Paul du Bois-Reymond dies in Freiburg.
• April 7, 1866 Erik Ivar Fredholm is born in Stockholm.
• April 7, 1922 Stefan Banach is awarded habilitation for a docent of mathematics from Jan Kazimierz University in Lvov.
• April 7, 1933 A law is passed in Germany that leads to the firing of Jews and other minorities from mathematics faculty positions.
• April 7, 1997 The International Congress of Mathematics prematurely announces the Riemann hypothesis has been proven; they fell prey to an April Fool's prank from Enrico Bombieri.