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On critical point theory for indefinite functionals in the presence of symmetries. (English) Zbl 0504.58014

MSC:
58E05 Abstract critical point theory (Morse theory, Lyusternik-Shnirel’man theory, etc.) in infinite-dimensional spaces
37J99 Dynamical aspects of finite-dimensional Hamiltonian and Lagrangian systems
22E70 Applications of Lie groups to the sciences; explicit representations
34C25 Periodic solutions to ordinary differential equations
37C80 Symmetries, equivariant dynamical systems (MSC2010)
70H05 Hamilton’s equations
37G99 Local and nonlocal bifurcation theory for dynamical systems
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