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adjective
(of a relation on a set) Having the property that if an element x is related to y and y is related to z, then x is necessarily related to z.

adjective
(of a group action) Such that, for any two elements of the acted-upon set, some group element maps the first to the second.

adjective
(of a graph) Such that, for any two vertices there exists an automorphism which maps one to the other.




