Hamiltonian systems Mathematical physics 4 Geometry, Differential 3 Celestial mechanics 2 Dynamics 2 Lie algebras 2 Mathematics 2 Perturbation (Mathematics) 2 Symplectic manifolds 2 Associative algebras 1 Astrophysics 1 Calculus of variations 1 Chaotic behavior in systems 1 Chaotic behvaior in systems 1 Contributions in dynamics 1 Critical point theory (Mathematical analysis) 1 Curves on surfaces 1 Differential equations, Nonlinear 1 Differential equations, Partial 1 Flows (Differentiable dynamical systems) 1 Fluid dynamics 1 Geodesic flows 1 Geodesics (Mathematics) 1 Global analysis (Mathematics) 1 Global differential geometry 1 Knot theory 1 Lagrange spaces 1 Lie groups 1 Many-body problem 1 Morse theory 1