Biregular graph

Graph families defined by their automorphisms
distance-transitive	${\displaystyle {\boldsymbol {\rightarrow }}}$	distance-regular	${\displaystyle {\boldsymbol {\leftarrow }}}$	strongly regular
${\displaystyle {\boldsymbol {\downarrow }}}$
symmetric (arc-transitive)	${\displaystyle {\boldsymbol {\leftarrow }}}$	t-transitive, t ≥ 2		skew-symmetric
${\displaystyle {\boldsymbol {\downarrow }}}$
(if connected) vertex- and edge-transitive	${\displaystyle {\boldsymbol {\rightarrow }}}$	edge-transitive and regular	${\displaystyle {\boldsymbol {\rightarrow }}}$	edge-transitive
${\displaystyle {\boldsymbol {\downarrow }}}$		${\displaystyle {\boldsymbol {\downarrow }}}$		${\displaystyle {\boldsymbol {\downarrow }}}$
vertex-transitive	${\displaystyle {\boldsymbol {\rightarrow }}}$	regular	${\displaystyle {\boldsymbol {\rightarrow }}}$	(if bipartite) biregular
${\displaystyle {\boldsymbol {\uparrow }}}$
Cayley graph	${\displaystyle {\boldsymbol {\leftarrow }}}$	zero-symmetric		asymmetric

In graph-theoretic mathematics, a biregular graph or semiregular bipartite graph is a bipartite graph ${\displaystyle G=(U,V,E)}$ for which every two vertices on the same side of the given bipartition have the same degree as each other. If the degree of the vertices in ${\displaystyle U}$ is ${\displaystyle x}$ and the degree of the vertices in ${\displaystyle V}$ is ${\displaystyle y}$, then the graph is said to be ${\displaystyle (x,y)}$-biregular.

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