Preface -- Contributors -- 1. F. Brock: Rearrangements and applications to symmetry problems in PDE -- 2. A. Farina: Liouville-type theorems for elliptic problems -- 3. M. Guedda: Similarity and pseudosimilarity solutions of degenerate boundary layer equations -- 4. N. Kenmochi: Monotonicity and compactness methods for nonlinear variational inequalities -- 5. H. Morimoto: Stationary Navier-Stokes flow in 2-D Channels involving the general outflow condition -- 6. P. Pucci and J. Serrin: Maximum principles for elliptic partial differential equations -- 7. V. Radelescu: Singular phenomena in nonlinear elliptic problems from blow-up boundary solutions to equations with singular nonlinearities -- Index.