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It is usually assumed that space-time is a continuum. This assumption is not required by Lorentz invariance. In this paper we give an example of a Lorentz invariant discrete space-time.Received 13 May 1946DOI:https://doi.org/10.1103/PhysRev.71.38©1947 American Physical Society
Hartland S. Snyder (Wed,) studied this question.