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DiracSigma[a, b] stands for i/2*(a . b - b . a) in 4 dimensions. a and b must have Head DiracGamma, DiracMatrix or DiracSlash. Only antisymmetry is implemented.
See also: DiracSigmaExplicit.
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| The FeynCalc Book |  DiracReduce |  DiracSigmaExplicit |