Viscosity solutions and applications : lectures given at the 2nd session of the Centro internazionale matematico estivo (C.I.M.E.) held in Montecatini Terme, Italy, June 12-20, 1995

Viscosity solutions: A primer.- Some applications of viscosity solutions to optimal control and differential games.- Regularity for fully nonlinear elliptic equations and motion by mean curvature.- Controlled markov processes, viscosity solutions and applications to mathematical finance.- Front propagation: Theory and applications.