Mathematical Sciences Classification System
70Kxx - Nonlinear dynamics 
[See also  34Cxx,  37-XX]
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                            70K05Phase plane analysis, limit cycles
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                            70K20Stability
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                            70K25Free motions
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                            70K28Parametric resonances
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                            70K30Nonlinear resonances
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                            70K40Forced motions
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                            70K42Equilibria and periodic trajectories
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                            70K43Quasi-periodic motions and invariant tori
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                            70K44Homoclinic and heteroclinic trajectories
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                            70K45Normal forms
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                            70K50Bifurcations and instability
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                            70K55Transition to stochasticity (chaotic behavior) [See also 37D45]
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                            70K60General perturbation schemes
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                            70K65Averaging of perturbations
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                            70K70Systems with slow and fast motions
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                            70K75Nonlinear modes
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                            70K99None of the above, but in this section