Poincaré's correspondence and varia
Henri Poincaré's collected correspondence is made up of over 2100 letters, touching upon matters private, administrative, and scientific. Of these, around 1080 are letters sent by Poincaré, while around 950 are addressed to him. Poincaré's circle of correspondents includes over 290 individuals, including many figures celebrated in the history of science, such as Heinrich Hertz, David Hilbert, and William Thomson (Lord Kelvin).
These letters may often be examined as either scanned images, annotated transcription, or both. Letters and varia may be selected according to a series of parameters via a calendar. Note that third-party correspondence, and translations of a selection of letters to Poincaré may be accessed either via this page, or via the Varia search engine. Many of the documents presented here have been published in one of the volumes available from Birkhäuser.