denoted math x math math math directed graph directed graph three vertices four directed edges double arrow represents edge direction '' 'directed graph''' '' 'digraph''' graph edges orientations one restricted common sense term '' 'directed graph''' ordered pair math g math comprising math v math set ' 'vertices'' also called ''nodes'' ''points'' math e subseteq left xy mid x v textrm x neq right math set ''edges'' also called ' 'directed edges'' ' 'directed links'' ' 'directed lines'' ''arrows'' ''arcs''
Formal science Mathematics Applied mathematics Graph theory