…the relativistic invariance is not destroyed by writing here some constant times phi equals zero instead. So the proposal was made by Yukawa that the forces of nuclei are determined by an equation of this type. Let's just look just one moment at the…

…successfully and their theories remained for a long time until we discovered all this junk. And this junk was not contemplated by Yukawa and therefore it's undoubtedly not as simple as the way Yukawa did it. Another place you can get stuck is at the…

…discovered all this junk. And this junk was not contemplated by Yukawa and therefore it's undoubtedly not as simple as the way Yukawa did it. Another place you can get stuck is at the experimental end. For example the quantum theory of gravitation is…