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Publication:3159051
zbMath1065.37043MaRDI QIDQ3159051
Publication date: 14 February 2005
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Variational methods involving nonlinear operators (47J30) Periodic solutions to ordinary differential equations (34C25) Abstract critical point theory (Morse theory, Lyusternik-Shnirel'man theory, etc.) in infinite-dimensional spaces (58E05) Dynamical system aspects of infinite-dimensional Hamiltonian and Lagrangian systems (37K99) Existence theories for free problems in one independent variable (49J05)
