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Tensorfunction[t, mu, nu, ...] transform into t[LorentzIndex[mu], LorentzIndex[nu], ...], i.e., it can be used as an unspecified tensoriell function t. A symmetric tensor can be obtained by Tensorfunction[{t, "S"}, mu, nu, ...], and an antisymmteric one by Tensorfunction[{t, "A"}, mu, nu, ...].
See also: Symmetrize.
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| The FeynCalc Book |  Tdec |  TFi |