The Principle of Equivalence, F. Rohrlich, Annals of Physics, 22, 160-191 (1963)
Various statements identified with the principle of equivalence are not acceptable because they are either not generally valid or are simply the definition of an inertial coordinate system. The accepted statement refers roughly speaking, to the equivalence of inertial mass with passive and active gravitational mass. The clarification of this problem is greatly eased by a detailed study of the static homogeneous gravitational field. The role of electromagnetic phenomena, and, in particular, the presents of a charge in such a field is analyzed in detail.