**Jules Tannery** (24 March 1848 – 11 December 1910) was a French mathematician, brother of the mathematician and historian of science Paul Tannery, who notably studied under Charles Hermite and was the PhD advisor of Jacques Hadamard.

Under Hermite, he received is doctorate in 1874 for his thesis *Propriétés des Intégrales des Équations Différentielle Linéaires à Coefficients Variables.*

Tannery discovered a surface of the fourth order of which all the geodesic lines are algebraic. He was not an inventor, however, but essentially a critic and methodologist. He once remarked, "Mathematicians are so used to their symbols and have so much fun playing with them, that it is sometimes necessary to take their toys away from them in order to oblige them to think."

He notably influenced Pierre Duhem, Paul Painlevé, Jules Drach, and Émile Borel to take up science.

His efforts were mainly directed to the study of the mathematical foundations and of the philosophical ideas implied in mathematical thinking. Tannery was "an original thinker, a successful teacher, and a writer endowed with an unusually clear, brilliant and attractive style."^{[1]}

*Leçons sur l'Arithmétique**Rôle du nombre dan les sciences**Introduction à la theorie des fonctions*- (in French) J. Tannery and J. Molk Eléments de la théorie des fonctions elliptiques. Tome I, Introduction. Calcul différentiel. Ire partie (Paris : Gauthier-Villars et fils, 1893)
- (in French) J. Tannery and J. Molk Eléments de la théorie des fonctions elliptiques. Tome II, Calcul différentiel. IIe partie (Paris : Gauthier-Villars et fils, 1893)
- (in French) J. Tannery and J. Molk Eléments de la théorie des fonctions elliptiques. Tome III, Calcul intégral. Ire partie, Théorèmes généraux. Inversion (Paris : Gauthier-Villars et fils, 1893)
- (in French) J. Tannery and J. Molk Eléments de la théorie des fonctions elliptiques. Tome IV, Calcul intégral. IIe partie, Applications (Paris : Gauthier-Villars et fils, 1893)

**^**G. B. Mathews (1910) Jules Tannery Nature 85:175 (#2145)

- George Sarton, "Paul, Jules, and Marie Tannery (with a note on Grégoire Wyrouboff),"
*Isis*,**Vol. 38**, No. 1/2. (Nov., 1947), pp. 33–51.

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