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Speed up OnDigraphs for a digraph and a permutation #267

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Speed up OnDigraphs for a digraph and a permutation #267

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Commits on May 23, 2021

  1. Speed up OnDigraphs for a graph and a permutation 

    * Instead of checking if the permutation fixes the vertices, check
if it is the identity (which is much cheaper, although catches
less cases)

* Do not check explictly if the permutation maps the vertices
  of the graph to itself, do the mapping then check afterwards.
    @ChrisJefferson @wilfwilson
    ChrisJefferson authored and wilfwilson committed May 23, 2021
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