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Today is Augustin Louis Cauchy's Birthday!
 Happy Birthday

Born:  August 21, 1789
in Paris, France

Died:  May 23, 1857
in Sceaux, near Paris, France

Cauchy was born a little less than six weeks after the fall of the Bastille.  Thus, as a child of the Revolution, he spent most of his life in a time of social revolution and the Napoleonic wars. 

Briefly, two major areas are associated with his work.  First, he introduced rigor into mathematical analysis.  Secondly, Cauchy made the study of groups both systematic and abstract.