The meaning of relativity by albert einstein

... principle, by the aid of the calculus of tensors We now inquire whether there is a relativity with respect to the state of motion of the space of reference; in other words, whether there are spaces of. .. point of view again in the theories of special and general relativity The Meaning of Relativity 20 distances of the particles, and is therefore an invariant The vector ∂Φ character of the force,... in the theory of special relativity (Minkowski's interpretation of the field) will then offer fewer difficulties The Meaning of Relativity 26 THE THEORY OF SPECIAL RELATIVITY THE previous considerations