12.2 Computer Representation Set Implementations of Digraphs pg 573 Definition a digraph G consists of a set V, called the vertices of G, and, for all VE V, a subset Av of V, called the set of vertices adjacent to v directed graph12.2 Computer Representation Set Implementations of Digraphs pg.573 Definition A digraph G consists of a set V , called the vertices of G, and, for all vV, a subset Av of V, called the set of vertices adjacent to v. directed graph