A New Method to get the Propagator of Electrodynamics

Abstract

In this article we offer a new method to obtain the Propagator of Electrodynamics. In order to achieve this goal we will use some important theorems of linear algebra such as the Cayley-Hamilton theorem and some theorems related to projection operators; thus providing an application of linear subspace theory in quantum field theory.

Keywords: linear algebra; Cayley-Hamilton's Theorem; electrodynamics