Calculus of Variations and Partial Differential Equations : Proceedings of a Conference held in Trento Italy June 16–21 1986 Global solvability of second order evolution equations in banach scales On the incompressible limit of the compressible Navier Stokes equations On a class of hyperbolic operators with double characteristics Relaxation problems in control theory The inclination of an H graph On the mathematical theory of vortex sheets New estimates of the fundamental solution and Wiener’s criterion for parabolic equations with variable coefficients Green function and invariant density for an integro differential operator Some remarks on the regularity of minimizers Quadratic functionals with splitting coefficients Minimal surfaces of finite index in manifolds of positive scalar curvature Remarks about the mathematical theory of liquid crystals On quasi minimal surfaces A survey of recent regularity results for second order queer differential equations On the diffusion coefficient of a semilinear Neumann problem Some isoperimetric inequalities for the level curves of capacity and Green’s functions on convex plane domains Nonhomogeneous quasilinear hyperbolic systems: Initial and boundary value problem Existence results for non convex problems of the calculus of variations Wiener criteria and variational convergences Fully nonlinear second order elliptic equations Positive solutions of a prescribed mean curvature problem On the convergence at infinity of solutions with finite dirichlet integral to the exterior dirichlet problem for the steady plane Navier Stokes system of equations The elliptic Sinh Gordon equation and the construction of toroidal soap bubbles.