vanishes completely and the preceding equations are superfluous; we are then in the presence of a classical space, whether Euclidean, Riemannian or Lobatchewskian.
Now it is a remarkable fact that these purely geometrical relations or equations which Weyl had discovered, expressing as they do the value of the Weylian curvature, are none other than Maxwell’s equations of the electromagnetic field, provided we identify the Weylian curvature
with the tensor
whose components represent electric and magnetic force, and provided we identify the elements of structure, the
’s, with the electromagnetic potentials, the
