Mathematical Sciences Classification System
81Rxx - Groups and algebras in quantum theory
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                            81R05
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                            81R10
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                            81R12
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                            81R15
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                            81R20Covariant wave equations
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                            81R25Spinor and twistor methods [See also 32L25]
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                            81R30
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                            81R40Symmetry breaking
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                            81R50
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                            81R60Noncommutative geometry
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                            81R99None of the above, but in this section