Augustin-Louis Cauchy
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Augustin-Louis Cauchy (1789-1857) was an extraordinary French mathematician, considered to be one of the top dozen of all time.[1] He was homeschooled and became prolific at publishing papers. His major contributions were in analysis, algebra and number theory, and famously developed group theory or the "theory of substitutions" and invented the calculus of residues. He was known for insisting on rigorous proofs.