Remarks on a Class of Semilinear Elliptic Equations on Rn
Via Perturbation Methods............................................................... 1
A. Ambrosetti, J. Garcia Azorero, and I. Peral

Invariant Curves of Mappings with Average Small Twist.................................. 14
Rafael Ortega

Symmetry of C1 Solutions of p-Laplace Equations in Rn .................................. 40
Lucio Damascelli and Mythily Ramaswamy

Convergence of Approximated Solutions to
A Nonstrictly Hyperbolic System ....................................................... 64
Yunguang Lu, Ignacio Mantilla, and  Leonardo Rendon

Regularity of Interfaces for an Inhomogeneous
Filtration Equation ................................................................... 80
M. Guedda, D. Hilhorst, and S. I .Shmarev

On the Solvability of Some Nonlinear
Neumann Problems ...................................................................... 102
A. M. Piccirillo, L. Toscano, and S. Toscano
 
A Unifying Maximum Principle for 
Conjugate Boundary Value Problems ..................................................... 121
Guy A. DEGLA
 
A Note on Closed Geodesics for a Class of 
Non-Compact Riemannian Manifolds ...................................................... 132
S. Secchi
 
Nonexistence Theorems for Systems of
Quasilinear Parabolic Inequalities .................................................... 143
Gabriella Caristi





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