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The Dirac matrix group and Fierz transformations

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The representation theory of the group generated by the Dirac matrices is studied. It is shown that the Fierz transformation can be expressed in terms of Racah coefficients of this group. A number of generalized Fierz transformations have been found. Simple rules are given for calculating Fierz invariants and anti-invariants.

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de Vries, E., van Zanten, A.J. The Dirac matrix group and Fierz transformations. Commun.Math. Phys. 17, 322–342 (1970). https://doi.org/10.1007/BF01646028

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