Abstract
In this paper, we consider the second order Hamiltonian system
Here, we assume 0 lies in a gap of σ(B) (the spectrum of B:= −d 2/dt 2 −A(t)). We find nontrivial and ground state T-periodic solutions for the second order Hamiltonian system under conditions weaker than those previously assumed; also, our proof is much more direct.
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Research supported by the Specialized Fund for the Doctoral Program of Higher Education and the National Natural Science Foundation of China.
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Chen, G., Ma, S. Ground state periodic solutions of second order Hamiltonian systems without spectrum 0. Isr. J. Math. 198, 111–127 (2013). https://doi.org/10.1007/s11856-013-0016-9
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DOI: https://doi.org/10.1007/s11856-013-0016-9