# Author:Pierre de Fermat

←Author Index: Fe | Pierre de Fermat (1601–1665) |

French lawyer and amateur mathematician; given credit for early developments leading to infinitesimal calculus, his research into number theory, and notable contributions to analytic geometry, probability, and optics |

## WorksEdit

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## Works aboutEdit

"Fermat, Pierre de," in *Encyclopædia Britannica* (11th ed., 1911)

**public domain** worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.