# 1911 Encyclopædia Britannica/Sturm, Jacques Charles François

**STURM, JACQUES CHARLES FRANÇOIS** (1803–1855),
French mathematician, of German extraction, was born at
Geneva on the 29th of September 1803. Originally tutor to
the son of Mme de Staël, he resolved, with his schoolfellow
Colladon, to try his fortune in Paris, and obtained employment
on the *Bulletin universel*. In 1829 he discovered the theorem,
regarding the determination of the number of real roots of a
numerical equation included between given limits, which bears
his name (see Equation, V.), and in the following year he was
appointed professor of mathematics at the Collège Rollin. He
was chosen a member of the Académie des Sciences in 1836,
became " répétiteur " in 1838, and in 1840 professor in the École
Polytechnique, and finally succeeded S. D. Poisson in the chair
of mechanics in the Faculté des Sciences at Paris. His works,
*Cours d'analyse de I'école polytechnique* (1857–1863) and *Cours*
*de mécanique de l'école polytechnique* (1861), were published after
his death at Paris on the 18th of December 1855.