Isotropy of Space

Abstract
It is well known that it is possible to deduce the Lorentz transformations solely on the basis of the principles of relativity, space-time homogeneity, and isotropy of space, without making any use of the principles of reciprocity and of the invariance of the velocity of light. Here we put forward a rigorous and simple formulation of the isotropy principle, which appears to be more general than those usually presented and which, together with the results of a preceding paper, allows us to carry out such a deduction in the physical case of a 4-dimensional space-time in a straightforward and considerably simplified way.

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