FeynCalc manual (development version)

PauliChainJoin

PauliChainJoin[exp] joins chains of Pauli matrices with explicit Pauli indices wrapped with a head PauliChain.

See also

Overview, PauliChain, PCHN, PauliIndex, PauliIndexDelta, DIDelta, PauliChainCombine, PauliChainExpand, PauliChainFactor.

Examples

PCHN[PauliXi[-I], i] PCHN[CSID[a] . CSID[b], i, j] PCHN[j, PauliEta[I]] 
 
PauliChainJoin[%]

(\eta )_j \left(\xi ^{\dagger }\right){}_i \left(\sigma ^a.\sigma ^b\right){}_{ij}

\xi ^{\dagger }.\sigma ^a.\sigma ^b.\eta