Mathematical Sciences Classification System
70Gxx - General models, approaches, and methods 
[See also  37-XX]
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                            70G10Generalized coordinates; event, impulse-energy, configuration, state, or phase space
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                            70G40Topological and differential-topological methods
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                            70G45
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                            70G55Algebraic geometry methods
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                            70G60Dynamical systems methods
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                            70G65Symmetries, Lie-group and Lie-algebra methods
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                            70G70Functional-analytic methods
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                            70G75Variational methods
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                            70G99None of the above, but in this section