Phys. Rev. Lett. 60, 656–656 (1988)Bombelli et al. replyReceived 30 November 1987; published in the issue dated 15 February 1988 The Lorentz invariance of a discrete space-time (casual structure) is commented upon. © 1988 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.60.656
DOI:
10.1103/PhysRevLett.60.656
PACS:
04.60.+n
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