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Periodic solutions of Hamiltonian equations. (English) Zbl 0522.58015
Dynamics and processes, Proc. 3rd Encounter Math. Phys., Bielefeld/ Ger. 1981, Lect. Notes Math. 1031, 172-213 (1983).

37J99 Dynamical aspects of finite-dimensional Hamiltonian and Lagrangian systems
37G99 Local and nonlocal bifurcation theory for dynamical systems
70H30 Other variational principles in mechanics
58E05 Abstract critical point theory (Morse theory, Lyusternik-Shnirel’man theory, etc.) in infinite-dimensional spaces
34C25 Periodic solutions to ordinary differential equations
58C30 Fixed-point theorems on manifolds