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Publication:3605652
zbMath1171.34029MaRDI QIDQ3605652
Fengjian Yang, Xinming Chen, Zhao-hong Sun
Publication date: 24 February 2009
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Hamiltonian systemsaddle point theoremSobolev's inequality(PS) conditionWirtinger's inequalitysubharmonic solution
Periodic solutions to ordinary differential equations (34C25) Set-valued operators (47H04) Abstract critical point theory (Morse theory, Lyusternik-Shnirel'man theory, etc.) in infinite-dimensional spaces (58E05)
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