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Two-degrees of freedom, Saddle-center, saddle-center, convexity, Periodic, homoclinic and heteroclinic orbits; variational methods, degree-theoretic methods, Conley–Zehnder index, Convexity, Relations of dynamical systems with symplectic geometry and topology, Index theory for dynamical systems, Morse-Conley indices, normal form, Conley-Zehnder index, periodic orbit, Periodic orbits of vector fields and flows, two-degrees of freedom, Hamiltonian systems, Analysis
Two-degrees of freedom, Saddle-center, saddle-center, convexity, Periodic, homoclinic and heteroclinic orbits; variational methods, degree-theoretic methods, Conley–Zehnder index, Convexity, Relations of dynamical systems with symplectic geometry and topology, Index theory for dynamical systems, Morse-Conley indices, normal form, Conley-Zehnder index, periodic orbit, Periodic orbits of vector fields and flows, two-degrees of freedom, Hamiltonian systems, Analysis
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