scientific article; zbMATH DE number 4001036
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Publication:4727072
zbMATH Open0617.58020MaRDI QIDQ4727072
Maria Letizia Bertotti, Eduard Zehnder
Publication date: 1986
Title of this publication is not available (Why is that?)
Abstract critical point theory (Morse theory, Lyusternik-Shnirel'man theory, etc.) in infinite-dimensional spaces (58E05) Dynamical aspects of finite-dimensional Hamiltonian and Lagrangian systems (37J99)
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An extension of the Poincaré-Birkhoff theorem coupling twist with lower and upper solutions ⋮ Periodic solutions of Hamiltonian systems with symmetries
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