General Relativity as a Symmetry of a Unified Space–Time–Action Geometrical Space

We derive the basic principles of Electromagnetism and general relativity from a common (geometrical) starting formulation we call START, from its geometrical structure as a Space– Time–Action Relativity Theory. Gravitation results from the epistemological approach of defining a test particle which explores the physical world in such a form that its trajectory indicates the influence of the rest of the system. Electromagnetism defines a collection of test particles, we call carriers, in interaction among themselves and with the rest of the system. General Relativity is then derived from a symmetry transformation of the quadratic space geometry corresponding to space–time and action and the philosophical principles of Einstein’s general relativity theory.