Abstract
In this paper we prove the existence of multiple periodic (harmonic and subharmonic) solutions for a class of planar Hamiltonian systems which includes the case of the second order scalar ODE $x'' + a(t)g(x) = 0$ with $g$ satisfying a one-sided condition of sublinear type. We consider the classical approach based on the Poincaré-Birkhoff fixed point theorem as well as some refinements on the side of the theory topological horseshoes. A Duffing-type equation and an exponential nonlinearity case are studied as applications.
Citation
Tobia Dondè. Fabio Zanolin. "Multiple periodic solutions for one-sided sublinear systems: A refinement of the Poincaré-Birkhoff approach." Topol. Methods Nonlinear Anal. 55 (2) 565 - 581, 2020. https://doi.org/10.12775/TMNA.2019.104