Biregular graph
= Biregular graph
= Semiregular bipartite graph
{synonym}
A biregular graph is a <bipartite graph> whose vertices have constant degree on each part separately. The two degree constants can differ. If its parts are $X,Y$ and its <edge density of a bipartite graph> is $\gamma$, the two degrees are $\gamma|Y|$ and $\gamma|X|$. Thus its adjacency function has constant row and column averages $\gamma$.