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On This Day ...

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

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September 25th

1644 Ole Romer born in Arhus. The Danish astronomer was the first to measure the speed of light.

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Ole Romer and the speed of light
1654 Fermat wrote Pascal to defend a combinatorial method that Pascal had previously regarded as incorrect.

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Pierre de Fermat
Blaise Pascal
1819 George Salmon born in Cork, Ireland. Like his friends Cayley and Sylvester, he would work in algebraic geometry.

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George Salmon
Arthur Cayley
James Joseph Sylvester

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