Cauchy, Augustin Louis, Baron

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Cauchy, Augustin Louis, Baron

(ōgüstăN` lwē bärôN` kōshē`), 1789–1857, French mathematician. He was professor simultaneously (1816–30) at the École polytechnique, the Sorbonne, and the Collège de France in Paris. While a political exile (1830–38) he taught at the Univ. of Turin. He returned to the Sorbonne in 1848. Besides his influential work in every branch of mathematics (especially the theory of functions, integral and differential calculus, and algebraic analysis) he contributed to astronomy, optics, hydrodynamics, and other fields. Among his nearly 800 publications are works on the theory of waves (1815), algebraic analysis (1821), elasticity (1822), infinitesimal calculus (1823, 1826–28), differential calculus (1827), and the dispersion of light (1836).
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In 1825 Augustin Cauchy was able to prove travelling around the larger square in the picture was the same mathematically as travelling around the smaller square.