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
“ In every community, there is work to be done. In every nation, there are wounds to heal. In every heart, there is the power to do it. ” ― Marianne Williamson