D-modules, Representation Theory, and Quantum Groups: Lectures given at the 2nd Session of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Venezia, Italy, June 12-20, 1992
Indice des systèmes différentiels.- Quantum groups.- Index theorems for R-constructible sheaves and for D-modules.- The equivariant Chern character and index of G-invariant operators. Lectures at CIME, Venise 1992.