Template:Today in Math History for August 31

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August 31, 1682 Jacques Ozanam poses a problem in the Journal des Sçavans asking for four numbers such that the difference of any two is a perfect square, and the sum of the first three being also a perfect square.
August 31, 1811 Louis Antoine de Bouganville dies in Paris.
August 31, 1880 Heinrich Franz Friedrich Tietze is born in Schleinz.
August 31, 1939 Hitler gives the order to invade Poland.
August 31, 1945 Stefan Banach dies in Lvov (now Lviv).

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