Schreier coset graph
= Schreier coset graph
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{wiki=Schreier_coset_graph}
For $H\leq G$ and a generating set $S$, the Schreier coset graph has vertices $Hg$ and a directed $s$-edge from $Hg$ to $Hgs$ for every $s\in S$. For a free group, this is the covering graph associated with $H$.