Jules Tannery

Jules Tannery (24 March 1848 – 11 December 1910) was a French mathematician, who notably studied under Charles Hermite and was the PhD advisor of Jacques Hadamard. Tannery's theorem on interchange of limits and series is named after him.[1] He was a brother of the mathematician and historian of science Paul Tannery.

Jules Tannery
Jules Tannery (1848-1910). Photo by A. Gerschel & Sons (c. 1866).
Born	(1848-03-24)24 March 1848 Mantes-sur-Seine, France
Died	11 December 1910(1910-12-11) (aged 62) Paris, France
Alma mater	École Normale Supérieure
Known for	Philosophy of mathematics
Scientific career
Fields	Mathematician
Institutions	École Normale Supérieure Université de Paris Sorbonne
Doctoral advisor	Charles Hermite
Doctoral students	Albert Châtelet Jacques Hadamard
Notes
Brother of Paul Tannery

Under Hermite, he received a doctorate in 1874 for his thesis Propriétés des intégrales des équations différentielles linéaires à coefficients variables.

Tannery was an advocate for mathematics education, particular as a means to train children in logical consequence through synthetic geometry and mathematical proofs.[2]

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."[3]