Abstract
We study the existence of periodic solutions of second order superlinear dynamical systems with a singularity of repulsive type. The proof is based on a well-known fixed point theorem for completely continuous operators. We do not need to consider so-called strong force conditions. Recent results in the literature are generalized and significantly improved.
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Chu, J., Zhang, Z. Periodic Solutions of Second Order Superlinear Singular Dynamical Systems. Acta Appl Math 111, 179–187 (2010). https://doi.org/10.1007/s10440-009-9539-9
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DOI: https://doi.org/10.1007/s10440-009-9539-9