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My QFT course assumes the following notation for gamma matrices:

[tex]\gamma ^{\mu_1 \mu_2 \mu_3 \mu_4} = {\gamma ^ {[\mu_1}}{\gamma ^ {\mu_2}}{\gamma ^ {\mu_3}}{\gamma ^ {\mu_4 ]}}[/tex]

what does the thing on the right hand side actually mean? Its seems to be a commutator of some sort.

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# Notation relating to gamma matrices

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