# .

# Jacques Charles François Sturm

Jacques Charles François Sturm (September 29, 1803 – December 15, 1855) was a French mathematician of German heritage.

Life and work

Sturm was born in Geneva in 1803. His family had emigrated from Strasbourg around 1760. In 1818, he started to follow the lectures of the academy of Geneva. In 1819, the death of his father forced Sturm to give lessons to children of the rich in order to support his own family. In 1823, he became tutor to the son of Madame de Staël.

At the end of 1823, Sturm stayed in Paris for a short time following the family of his student. He resolved, with his school-fellow Colladon, to try his fortune in Paris, and obtained employment on the Bulletin universel. In 1829, he discovered the theorem which bears his name and which concerns the determination of the number of real roots of a numerical equation included between given limits,.

Sturm benefited from the 1830 revolution, as his Protestant faith ceased to be an obstacle to employment in public high schools. At the end of 1830, he was thus appointed as a professor of Mathématiques Spéciales at the collège Rollin.

He was chosen a member of the Académie des Sciences in 1836, filling the seat of André-Marie Ampère. Sturm became répétiteur in 1838, and in 1840 professor in the École Polytechnique. The same year, after the death of SD Poisson, Sturm was appointed as mechanics professor of the Faculté des Sciences of Paris. His works, Cours d'analyse de l'école polytechnique (1857–1863) and Cours de mécanique de l'école polytechnique (1861), were published after his death in Paris, and were regularly republished.

He was the co-eponym of the Sturm–Liouville theory with Joseph Liouville. Sturm's theorem is a basic result for proving the existence of real zeroes of functions.

In 1826, with his colleague Jean-Daniel Colladon, Sturm helped make the first experimental determination of the speed of sound in water.[1]

In 1851 his health began to fail. He was able to return to teaching for a while during his long illness, but in 1855 he died. [2]

Sturm's name is part of the list of the 72 names engraved at the Eiffel Tower.

Distinctions

* Grand prix de Mathématiques (December 4, 1834)

* Member of the academy of Berlin (1835)

* Member of the academy of Saint-Petersburg (1836)

* Officier de la Légion d'Honneur (1837)

* Copley Medal of the Royal Society of London (1840)

* Member of the Royal Society of London (1840)

Selected writing

* Cours d'analyse de l'Ecole polytechnique. Tome premier (Gauthier-Villars, 1877)

* Cours d'analyse de l'Ecole polytechnique. Tome second (Gauthier-Villars, 1877)

* Cours de mécanique de l'Ecole polytechnique (Gauthier-Villars, 1883)

See also

* Sturm–Liouville theory

* Sturm's theorem

* Sturm-Picone comparison theorem

* Sturm separation theorem

References

* This article incorporates text from the Encyclopædia Britannica, Eleventh Edition, a publication now in the public domain.

External links

* O'Connor, John J.; Robertson, Edmund F., "Jacques Charles François Sturm", MacTutor History of Mathematics archive, University of St Andrews, http://www-history.mcs.st-andrews.ac.uk/Biographies/Sturm.html .

* Notice sur la vie et les travaux de M. Sturm Nouvelles annales de mathématiques journal des candidats aux écoles polytechnique et normale 15 p. 72 (1856)

Retrieved from "http://en.wikipedia.org/"

All text is available under the terms of the GNU Free Documentation License