FCPauliIsolate
FCPauliIsolate[exp]
wraps chains of Pauli matrices into heads specified by the user.
See also
Overview
Examples
FCPauliIsolate[y SI[i] + x PauliXi[-I] . SIS[p1] . PauliEta[I] . PauliEta[-I] . SIS[p2] . PauliXi[I], Head -> pChain]
ypChain(σˉi)+xpChain(ξ†.(σˉ⋅p1).η)pChain(η†.(σˉ⋅p2).ξ)