MULTIPLE PERIODIC SOLUTIONS FOR ONE-SIDED SUBLINEAR SYSTEMS: A REFINEMENT OF THE POINCARE-BIRKHOFF APPROACH

被引:5
作者
Donde, Tobia [1 ]
Zanolin, Fabio [1 ]
机构
[1] Univ Udine, Dept Math Comp Sci & Phys, Via Sci 206, I-33100 Udine, Italy
关键词
Poincare-Birkhoff theorem; bend-twist maps; topological horseshoes; periodic solutions; complex oscillations; SUBHARMONIC SOLUTIONS; THEOREM; EQUATIONS;
D O I
10.12775/TMNA.2019.104
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
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 Poincare-Birkhoff fixed point theorem as well as some refinements on the side of the theory of topological horseshoes. A Duffing-type equation and an exponential nonlinearity case are studied as applications.
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页码:565 / 581
页数:17
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