FCLoopMixedIntegralQ[exp] returns True if the integral contains both Lorentz and Cartesian indices and momenta.
FCLoopMixedIntegralQ[exp]
True
Overview
FCI[FVD[p, mu] CFAD[q, q - p]] FCLoopMixedIntegralQ[%]
pmu(q2−iη).((q−p)2−iη)\frac{p^{\text{mu}}}{(q^2-i \eta ).((q-p)^2-i \eta )}(q2−iη).((q−p)2−iη)pmu
True\text{True}True
FCI[FVD[p, mu] FAD[q, q - p]] FCLoopMixedIntegralQ[%]
pmuq2.(q−p)2\frac{p^{\text{mu}}}{q^2.(q-p)^2}q2.(q−p)2pmu
False\text{False}False