Bipartite graph

Bipartite graph --- двудольный граф.

A bipartite graph is a graph whose vertex set can be partitioned into two nonempty subsets [math]\displaystyle{ V }[/math] and [math]\displaystyle{ W }[/math] such that every edge of [math]\displaystyle{ G }[/math] joins [math]\displaystyle{ V }[/math] and [math]\displaystyle{ W }[/math].