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Drach was encouraged by Jules Tannery to undertake mathematical research and he obtained a doctorate from École Normale Supérieure in 1898. He taught at many universities including Lille, Poitiers, Toulouse and Paris.
Drach viewed Emile Picard's application, in 1887, of Galois theory to linear differential equations as a model of perfection and he tried to extend Galois theory to differential equations in general building on the work of Lie and Vessiot in addition to that of Emile Picard.
Drach was a friend of Borel, and together they published lectures by Poincaré and by Jules Tannery. Drach helped to prepare Poincaré's works for publication. These appeared in 11 volumes between 1916 and 1956.
References (2 books/articles)