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'''Associated Cayley digraph''' | '''Associated Cayley digraph''' — ''[[соотнесённый орграф Кэли]].'' | ||
Let <math>\Gamma</math> be a group and <math>S</math> be a generating set of <math>\Gamma</math> such that | Let <math>\,\Gamma</math> be a group and <math>\,S</math> be a generating set of <math>\,\Gamma</math> such that | ||
(1) <math>e \not \in S</math>, <math>e</math> is the identity in <math>\Gamma</math>, | (1) <math>e \not \in S</math>, <math>\,e</math> is the identity in <math>\,\Gamma</math>, | ||
(2) <math>s \in S \Leftrightarrow s^{-1} \in S</math>. | (2) <math>s \in S \Leftrightarrow s^{-1} \in S</math>. | ||
The '''associated Cayley digraph''' <math>Cay(\Gamma,S)</math> is a digraph | The '''associated Cayley digraph''' <math>\,Cay(\Gamma,S)</math> is a digraph | ||
whose vertices are the elements of <math>\Gamma</math> and arcs are the | whose [[vertex|vertices]] are the elements of <math>\,\Gamma</math> and [[arc|arcs]] are the | ||
couples <math>(x,sx)</math> for <math>x \in \Gamma</math> and <math>s \in S</math>. | couples <math>\,(x,sx)</math> for <math>x \in \Gamma</math> and <math>s \in S</math>. | ||
With this definition, <math>Cay(\Gamma,S)</math> is a connected symmetric digraph | With this definition, <math>\,Cay(\Gamma,S)</math> is a connected symmetric [[digraph]] | ||
(in fact, a strongly connected digraph). | (in fact, a strongly connected digraph). |