Augustin-Louis Cauchy (August 21, 1789 to May 23, 1857) Cauchy is regarded as one of the greatest and most influential mathematicians in history. He was also one of the most prolific, having written about 800 research papers. He almost single-handedly founded the theory of functions of a complex variable, which has extensive applications in physics. He also helped put mathematical analysis (basically, the study of continuous quantities) on a rigorous foundation. In the words of the mathematician Hans Freudenthal, “More concepts and theorems have been named for Cauchy than for any other mathematician…” A very long, but partial list is given here: https://en.wikipedia.org/wiki/List_of_things_named_after_Augustin-Louis_Cauchy In addition to his work in pure mathematics, he worked extensively in mathematical physics, including the theory of light waves, elasticity, and mechanics. Cauchy was a very devout Catholic and a member of the Society of St. Vincent de Paul. It was partly through his influence that the famous mathematician Charles Hermite returned to the Catholic faith.
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