Mathematical Sciences Classification System
70Hxx - Hamiltonian and Lagrangian mechanics 
[See also  37Jxx]
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                            70H03Lagrange's equations
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                            70H05Hamilton's equations
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                            70H06Completely integrable systems and methods of integration
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                            70H07Nonintegrable systems
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                            70H08Nearly integrable Hamiltonian systems, KAM theory
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                            70H09Perturbation theories
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                            70H11Adiabatic invariants
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                            70H12Periodic and almost periodic solutions
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                            70H14Stability problems
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                            70H15Canonical and symplectic transformations
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                            70H20Hamilton-Jacobi equations
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                            70H25Hamilton's principle
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                            70H30Other variational principles
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                            70H33Symmetries and conservation laws, reverse symmetries, invariant manifolds and their bifurcations, reduction
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                            70H40Relativistic dynamics
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                            70H45
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                            70H50Higher-order theories
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                            70H99None of the above, but in this section