PauliSigmaCombine
PauliSigmaCombine[exp]
is (nearly) the inverse operation to PauliSigmaExpand.
See also
Overview, PauliSigmaExpand.
Examples
SIS[p] + SIS[q]
PauliSigmaCombine[%]
σˉ⋅p+σˉ⋅q
σˉ⋅(p+q)
PauliXi[-I] . (SIS[p1 + p2] + SIS[q]) . PauliEta[I]
PauliSigmaCombine[%]
ξ†.(σˉ⋅(p1+p2)+σˉ⋅q).η
ξ†.(σˉ⋅(p1+p2+q)).η