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. The topics discussed are transport equations for
nonsmooth vector fields homogenization viscosity methods for the infinite Laplacian weak KAM
theory and geometrical aspects of symmetrization. A historical overview of all CIME courses on
the calculus of variations and partial differential equations is contributed by Elvira Mascolo.
