Last revision was 1 July 2022. And this is AP's 192nd published book of science.
AP's 192nd book of Science// Translating Dirac's Hamiltonian and Lagrangian into New Physics of the AP-EM Equations of Electrodynamics. The reason these fancy math artifices are thrown out is because Old Physics had the Maxwell Equations full of errors, -- missing terms and outright false law of no magnetic monopole. So in order to get some reasonable solutions to experiments on Maxwell EM theory, these artificial math methods had to be hauled in to patch up the error filled Maxwell Equations.
Cover Is my iphone photograph of page 257 ---- in Dirac's book "The Principles of Quantum Mechanics" 1957, showing how much of physics had become a game of algebra manipulation for the reason that Maxwell Equations were so very much error filled equations. And that playing games of matrices could overcome some of the error filled Maxwell Equations.