Periodic solutions for discrete convex Hamiltonian systems via Clarke duality
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College of Mathematics and Econometrics, Hunan University, College of Mathematics and Information Science, Guangzhou University, Guangzhou, Guangdong, 510405
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College of Mathematics and Econometrics, Hunan University, Changsha, Hunan, 410082
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College of Mathematics and Information Science, Guangzhou University, Guangzhou, Guangdong, 510405