This notebook discusses Lorentz-invariant discretizations of spacetime, how to extract a graph from them, and how to reconstruct a (discretized) metric from it.
Note -- Some interactive parts of the code involve widgets: to visualize them, you will have to run the notebook yourself.
Based on papers
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F Dowker, J Henson and R D Sorkin, Mod. Phys. Lett. A19 (2004)
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R R Coifman and S Lafon. Applied and Computational Harmonic Analysis 21 (2006)
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S Varadhan, Comm. Pure Appl. Math. 20 (1967)