An elliptic problem with arbitrarily small positive solutions.
Existence of stable periodic solutions of a semilinear parabolic problem under Hammerstein-type conditions.
A multiplicity result for a class of quasilinear elliptic and parabolic problems.
On the Fast Convergence of a Galerkin-Like Method for Equations of the Second Kind.
A quasi-Newton method for solving fixed point problems in Hilbert spaces.
Periodic solutions of Liénard equations
Periodic solutions of the Rayleigh equation with damping of definite sign
The existence of a non-trivial periodic solution for the autonomous Rayleigh equation is proved, assuming conditions which do not imply that has a definite sign for large. A similar result is obtained for the periodically forced equation .
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