Olivier Bruneau

Indispensable for understanding Henri Poincaré's vast activity in the mathematical sciences. Provides new sources revealing Poincaré's involvement as president of the "Commission permanente du Répertoire bibliographique des sciences mathématiques" as an actor in the "Dreyfus Affair," and on his links with the editors of the major mathematical journals.

The letters, many of which are unpublished, are fully annotated with an emphasis on