ABSTRACT
Feynman shows that the experimental situation is not very clear in connection with the conserved vector current. He said also that if the conserved vector current hypothesis crumbles, nothing will crumble with it. It is true that there is not a vast structure of theory that will fall down, but there is some structure. The people who have engaged in speculation about partially conserved currents include Schwinger, Bludman, Glashow, Gursey, Nambu, and Salam. The chapter discusses charge exchange currents only, without prejudice to the question of whether there are also neutral or charge retention currents. Glashow has examined the commutation rules of W for the leptons, for which only the free Lagrangians must be included, since there are no strong interactions.
