stylistic:style_transfer
Mixed graph

A mixed graph is a graph in which some edges may be directed and some may be undirected. It is an ordered triple G = (V, E, A) for a mixed simple graph and G = (V, E, A, ϕ, ϕ) for a mixed multigraph with V, E (the undirected edges), A (the directed edges), ϕ and ϕ defined as above. Directed and undirected graphs are special cases.