…rid of this term. Several different possible things have been made to save the day. One way that was proposed by Born and Infeld is to change the Maxwell equations in the first place so that they're no longer linear in a complicated way, the result…

…a consistent quantum theory of any of the modified theories, that is the theory with the non-Maxwell equations of Born and Infeld, have never been satisfactorily made into a quantum theory. The theory with advanced and retarded waves of Dirac or Wheeler and…