World Congress of Nonlinear Analysts '92 Munzinger Str. 9 This collection of articles contains January 2007 A This collection of articles contains contributions from a few of Werner Leinfellner's many friends and colleagues Trotzdem habe ich es unternommen August 19 26 N Some remarks about the existence of positive solutions for elliptic systems Sub and supersolutions of nonlinear elliptic and parabolic problems Positive solutions and boundary value problems of singular and nonsingular type On the asymptotic behavior of laminar flow through a porous pipe The monotone method for third order boundary value problems Duality and variational principles for nonlinear hyperbolic equations Decay and global existence for some nonlinear dissipative wave equations On the philosophy of the spectral variable Wave propagation in uniaxial nonconducting nonlinear thermoelastic solids Approximation of dissipative hereditary systems Stefan problems in several space variables with dynamic boundary conditions Existence and multiplicity of periodic solutions for semilinear parabolic equations Boundary integral solution of a nonlinear heat conduction problem On the existence of travelling waves in reaction diffusion systems The strong maximum principle for cooperative periodic parabolic systems and the existence of principal eigenvalues Blowing up of solutions of semilinear parabolic equations An existence and uniqueness theorem for solutions of nonlocal parabolic partial differential equations Open problems in nonlinear ordinary boundary value problems arising from the study of large amplitude periodic oscillations in suspension bridges One species extinction in an autonomous competition model Periodic stability and reachability of nonlinear parabolic equations under boundary periodic perturbations A criterion for asymptotic stability based on topological degree Periodic solutions and subharmonic solutions for a class of planar systems of Lotka Volterra type Periodic boundary value problems for impulsive integro ordinary differential equations Some multiplicity results for subharmonic solutions to second order nonautonomous systems New results in quenching On the life span of solutions to nonlinear wave equations Conversion and penetration fronts in combustion The transition from decay to blow up in some reaction diffusion convection equations Numerical Experiments on the Ginzburg Landau Equations Counterexamples to the existence of inertial manifolds Inverse problems versus an algebraic spectral method for nonlinear evolution equations A finite difference scheme for an inverse heat equation Nonlinear ill posed problems Maximum entropy regularization of nonlinear ill posed problems Variational derivatives in function spaces Radial and nonradial solutions of a nonlinear scalar field equation A geometric method for the periodic problem Large perturbations of Toda lattices Distribution of mass principle and its applications to nonlinear elliptic equations Attractors of bipolar and non Newtonian viscous fluids Nonlinear d