Siméon Denis Poisson, cropped portrait from a lithograph
. Portrait source. François-Séraphin Delpech, after Nicolas Eustache Maurin; existing crop hosted on Wikimedia Commons. The file cites the Smithsonian Libraries Scientific Identity source. Public-domain artwork; faithful reproduction, PD-Art / Public Domain Mark.
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Siméon Denis Poisson (1781–1840) was a French mathematician and physicist known for his contributions to various fields, including mathematics, physics, and probability theory. He is best known for the Poisson distribution in probability theory, which describes the number of events occurring in a fixed interval of time or space under certain conditions, reflecting events that occur independently and with a known constant mean rate.
