Volume 6     Number 4      October     2000   

Contents: 

Kosuke Ono and Walter A. Strauss:  Regular solutions of the Vlasov--Poisson--Fokker--Planck system  751

Frank Blume:  Minimal rates of entropy convergence for rank one systems   773

Q-Heung Choi and Tacksun Jung:  A nonlinear wave equation with jumping nonlinearity  797

K.H. Wong, C. Myburgh, L. Omari:  A gradient flow approach for computing jump linear quadratic optimal feedback gains  803

Jaume Llibre, Jes\'us S. P\'erez del R{\'\i }o and J. Angel Rodr{\'\i }guez:  Structural stability of planar semi--homogeneous polynomial vector fields: applications to critical points and to infinity   809

A.V. Rezounenko:  Inertial manifolds with delay for retarded semilinear parabolic equations  829

S. Mohamad and K. Gopalsamy:  Neuronal dynamics in time varying environments: Continuous and discrete time models  841

Anna Capietto and Walter Dambrosio:  A topological degree approach to sublinear systems of second order differential equations 861

T. Caraballo, J. A. Langa, and J. C. Robinson:  Stability and random attractors for a reaction-diffusion equation with multiplicative noise       875

Jose S. C\'{a}novas and Antonio Falc\'{o}:  The set of periods for a class of skew--products 893

V. Afraimovich, J. Schmeling, E. Ugalde, and J. Ur\'{\i}as:  Spectra of dimensions for Poincar\'e recurrences 901

Makoto Mori:  Higher order mixing property of piecewise linear transformations  915

C.P. Walkden:  Solutions to the twisted cocycle equation over hyperbolic systems 935

Peter Tak\'a\v{c}:  Stabilization of positive solutions for analytic gradient-like systems 947

Piermarco Cannarsa, Cristina Pignotti and Carlo Sinestrari:  Semiconcavity for optimal control problems with exit time 975

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