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Graph3D[GeneralizedGridGraph[{4"Directed",4"Directed",4"Directed"}]]
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Projective Space

Metric in branch space

Minimum number of updates to derive both points
(i.e. its the common ancestor distance in the tree)

Finding that common ancestor distance might be computationally hard

---> geometric group theory
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TransitiveClosureGraph[GridGraph[{5,5}]]
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TransitiveReductionGraph
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TransitiveReductionGraph
,VertexLabelsAutomatic
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Table[TransitiveReductionGraph[MultiwaySystem[{"A""AB","B""A"},"A",t,"BranchialGraph"]],{t,2,5}]
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Projective space

Modding out the metric by a constant
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Tuples[Range[3],2]
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{{1,1},{1,2},{1,3},{2,1},{2,2},{2,3},{3,1},{3,2},{3,3}}
If these were critical pairs, this must define a transitive binary relation......
What are the transitive binary relations on n elements?
[ Quantum states are rays in Hilbert space ]

<Transitivity is discrete rescaling>

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