Calculating Pauli–Jordan function

Abstract

Abstract A derivation of the space-time expression of the Pauli–Jordan function (PJF) was shown and a more compact result was obtained. Compared to other derivations, the approach utilizes more physical image, such as a Lorentz invariance of the PJF. Furthermore, the approach does not need sophisticated mathematical techniques and is therefore more suitable for the beginner of quantum field theory, such as graduate students and senior undergraduates.