Union of graphs
Материал из WEGA
Union of graphs --- объединение графов.
The union of two graphs (not necessarily disjoint) [math]\displaystyle{ G }[/math] and [math]\displaystyle{ H }[/math], denoted by [math]\displaystyle{ G \cup H }[/math], is the graph with the point set [math]\displaystyle{ V(G \cup H) = V(G) \cup V(H) }[/math] and the edge set [math]\displaystyle{ E(G \cup H) = E(G) \cup E(H) }[/math].
