Henri Poincar\'e and his "model" of hyperbolic geometry
  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. 
Philippe Nabonnand (LHSP)
math.HO