Using the homological link theorem and iteration inequalities of Maslov-type index, we prove the multiplicity of subharmonic solutions for some variant subquadratic non-autonomous Hamiltonian systems. Moreover, the minimal period problem has also been considered for the variant subquadratic autonomous Hamiltonian systems.
Topol. Methods Nonlinear Anal.
55(2):
517-532
(2020).
DOI: 10.12775/TMNA.2019.105
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