Template:Selected anniversaries/October 9
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1581: Mathematician and linguist Claude Gaspard Bachet de Méziriac born. He will do work in number theory and find a method of constructing magic squares.
1582: Astronomer and mathematician Michael Maestlin uses Copernican system of the solar system to predict imminent outbreak of crimes against mathematical constants.
1859: Alfred Dreyfus born. He will be wrongly convicted of treason during the Dreyfus affair.
2002: Portable envy components at risk of capacitor plague.
