This volume provides the texts of lectures given by L. Ambrosio, L.
Caffarelli, M. Crandall, L.C. Evans, N. Fusco at the Summer course held
in Cetraro, Italy in 2005. These are introductory reports on current
research by world leaders in the fields of calculus of variations and
partial differential equations. Coverage includes transport equations
for nonsmooth vector fields, viscosity methods for the infinite
Laplacian, and geometrical aspects of symmetrization.