Albert Girard

Albert Girard French Mathematician

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Albert Girard is a member of the following lists: Leiden University alumni, People from Leiden and Dutch people of French descent.

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Details

First Name Albert
Last Name Girard
Birthday 30th November, 1594
Died 1632
Nationality French
Occupation Mathematician

Albert Girard () (11 October 1595 in Saint-Mihiel, France − 8 December 1632 in Leiden, The Netherlands) was a French-born mathematician. He studied at the University of Leiden. He "had early thoughts on the fundamental theorem of algebra" and gave the inductive definition for the Fibonacci numbers. He was the first to use the abbreviations 'sin', 'cos' and 'tan' for the trigonometric functions in a treatise. Girard was the first to state, in 1625, that each prime of the form 1 mod 4 is the sum of two squares. (See Fermat's theorem on sums of two squares.) It was said that he was quiet-natured and, unlike most mathematicians, did not keep a journal for his personal life.

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