Important: The networks package has been deprecated.  Use the superseding command GraphTheory[GraphUnion] instead.

This procedure creates a graph whose vertex set is the usual set-theoretic union of the vertex sets of G and H, and which has an edge for each edge of G and for each edge of H.

Multiple edges that have the same endpoints are retained unless 'SIMPLE' is specified, in which case multiple edges are reduced to a single edge.

This routine is normally loaded by using the command with(networks), but it may also be referenced by using the full name networks[gunion](...).