The B-(3) field as a link between gravitation and electromagnetism in the vacuum

The emergence of the Be-(3) field in vacuo has shown that electromagnetism is non-Abelian and similar in structure to gravitation. In this paper the Christoffel symbol used in general relativity is developed for electromagnetism in curvilinear coordinates: The former becomes describable as the antisymmetric part of the gravitational Ricci tenser. Therefore gravitation and electromagnetism are respectively the symmetric and antisymmetric parts of the same Ricci tensor within a proportionality factor. Both fields are obtained from the Riemann curvature tensor, both are expressions of curvature in spacetime.