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Publication:3099695
zbMath1252.34046MaRDI QIDQ3099695
Publication date: 1 December 2011
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Periodic solutions to ordinary differential equations (34C25) Abstract critical point theory (Morse theory, Lyusternik-Shnirel'man theory, etc.) in infinite-dimensional spaces (58E05) Applications of variational problems in infinite-dimensional spaces to the sciences (58E50)