Henri Poincar\'e and his "model" of hyperbolic geometry

Abstract

The aim of the talk is to trace how and when Henri Poincar\'e used non-Euclidean geometries (NEG) in his mathematical and philosophical works, with a particular attention to the genesis and the description of his model. We begin by a short presentation of the context of NEG in France around the 1870-80s. Then we expound from several sources the introduction and use of NEG in Poincar\'e's work about Fuchsian functions and we stress on the analogy between elliptic functions and fuchsian functions.