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Causal set theory (CST) is a discrete approach to quantum gravity which postulates that at the most fundamental level, spacetime is a locally finite partially ordered set. The partial order on the set is a proto-causality relation while local finiteness is a local discreteness requirement. In the continuum approximation the former corresponds to the spacetime causality relation and the latter ensures that finite volume regions in a spacetime contain only a finite number of "fundamental"arXiv:1903.11544v1 fatcat:mfsx425lczfnjkvbdnfhsi42pm