## Poisson, Siméon Denis (1781–1840)Poisson extended the work of Joseph Louis Lagrange on celestial mechanics and worked on integration and the Fourier series. In Researches on the Probability of Opinions (1837), he presented the Poisson distribution, which gives the probability of the occurrence of a specific event among a large number of events. Poisson's ratio, which relates lateral contraction to longitudinal extension in stressed materials, is also named after him. In all he wrote more
than 300 papers on mathematics, physics, and astronomy, and his Traité
de mécanique (1811) was long a standard work. ## Related category• MATHEMATICIANS | ||||||

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