FeynCalc manual (development version)

NonCommQ

NonCommQ[exp] yields True if exp contains non-commutative objects (i.e. those objects which are listed in $NonComm) not inside DiracTraces or SUNTraces.

See also

Overview, $NonComm, NonCommFreeQ, DiracTrace, SUNTrace.

Examples

NonCommQ[xx + yy]

\text{False}

NonCommQ[GA[\[Mu]] . GS[p + m] . GA[\[Mu]]]

\text{True}

NonCommQ[DCHN[GA[\[Mu]], i, j]]

\text{True}