
doi: 10.1007/pl00009909
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Abstract critical point theory (Morse theory, Lyusternik-Shnirel'man theory, etc.) in infinite-dimensional spaces, Homoclinic and heteroclinic solutions to ordinary differential equations, Periodic, homoclinic and heteroclinic orbits; variational methods, degree-theoretic methods
Abstract critical point theory (Morse theory, Lyusternik-Shnirel'man theory, etc.) in infinite-dimensional spaces, Homoclinic and heteroclinic solutions to ordinary differential equations, Periodic, homoclinic and heteroclinic orbits; variational methods, degree-theoretic methods
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