2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/111135This article concerns the fate of local Lorentz invariance in quantum gravity, particularly for approaches in which a discrete structure replaces continuum spacetime. Some features of standard quantum mechanics, presented in a sum-over-histories formulation, are reviewed, and their consequences for such theories are discussed. It is argued that, if the individual histories of a theory give bad approximations to macroscopic continuum properties in some frames, then it is inevitable that the theory violates Lorentz symmetry.15 pages, 1 figure, laTeXGeneral Relativity and Quantum Cosmologytext