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Augustin-Louis Cauchy
Augustin-Louis Cauchy was the 19th-century French mathematician who transformed calculus from a bag of clever tricks into a fortress of rigorous proofs, launched the modern theory of complex functions, and still found time to write roughly 800 research papers—more than most of us write grocery lists.
PeopleKarl Weierstrass
Karl Weierstrass transformed mathematics from an intuitive art into a rigorous science by constructing the first fully precise definitions of limits, continuity, and convergence, thereby earning the title “father of modern analysis.”