Description

Tr[exp] calculates the Dirac trace of exp. Depending on the setting of the option SUNTrace also a trace over SU(N) objects is performed. Tr is identical toDiracTrace, up to the default setting of DiracTraceEvaluate.

See also: DiracSimplify, DiracTrace, FermionSpinSum, SUNTrace.

Examples

$West=False should be set before any calculation is done (because intermediate results from trace calculations are cached).

The FeynCalc Book

ToTFi

Trick