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On This Day ...

Important events from the history of math that happened on this day:

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September 1st

1648 Marin Mersenne died in Paris, France. A mathematician himself, he was even better known for his regular correspondence with the leading French mathematicians of his day.

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Marin Mersenne
1967 Harvey Friedman was appointed Assistant Professor of Mathematics at Stanford University just three weeks before his nineteenth birthday (he was born Sept. 23, 1948). He is now (as of 2012) a distinguished logician at The Ohio State University.

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Harvey Friedman
1982 Ludwig Bieberbach, who stated the Bieberbach Conjecture in 1916, died in Oberbayern, Germany on this day. Bieberbach became a Nazi in 1933 when Hitler came to power. After years of helping dismiss former friends from their academic positions simply because they were Jewish, Bieberbach himself, in 1945, was dismissed from his own academic positions in Germany, but continued to write influential mathematics books. Louis de Branges proved the Bieberbach Conjecture in 1985.

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Ludwig Bieberbach
Louis de Branges

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