Mathematical Sciences Classification System
70Sxx - Classical field theories 
[See also  37Kxx,  37Lxx,  78-XX,  81Txx,  83-XX]
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                            70S05Lagrangian formalism and Hamiltonian formalism
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                            70S10Symmetries and conservation laws
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                            70S15Yang-Mills and other gauge theories
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                            70S20More general nonquantum field theories
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                            70S99None of the above, but in this section