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.
1917: Mathematician and philosopher Georg Cantor publishes new theory of sets derived from Gnomon algorithm functions. Colleagues hail it as "a magisterial contribution to science and art of detecting and preventing 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.
