Mathematical Sciences Classification System
83Cxx - General relativity
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83C05Einstein's equations (general structure, canonical formalism, Cauchy problems)
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83C10Equations of motion
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83C15Exact solutions
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83C20Classes of solutions; algebraically special solutions, metrics with symmetries
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83C22Einstein-Maxwell equations
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83C25Approximation procedures, weak fields
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83C27Lattice gravity, Regge calculus and other discrete methods
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83C30Asymptotic procedures (radiation, news functions, H-spaces, etc.)
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83C35Gravitational waves
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83C40Gravitational energy and conservation laws; groups of motions
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83C45Quantization of the gravitational field
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83C47Methods of quantum field theory [See also 81T20]
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83C50Electromagnetic fields
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83C55Macroscopic interaction of the gravitational field with matter (hydrodynamics, etc.)
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83C57Black holes
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83C60Spinor and twistor methods; Newman-Penrose formalism
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83C65Methods of noncommutative geometry [See also 58B34]
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83C75Space-time singularities, cosmic censorship, etc.
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83C80Analogues in lower dimensions
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83C99None of the above, but in this section