from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The difference between the dimension of a space and the dimension of a given subspace of the first one.


co- +‎ dimension (Wiktionary)


  • In this case, the integrals over codimension-one slices are not interpreted as the total charge (which is quantized and conserved) but as the total entropy on the slice (which is not quantized, it's approximate, and increases).

    The Reference Frame

  • The reason is that adding a clique of size norm must have tiny average on any subspace of small codimension.

    Gowers's Weblog


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