Definition:Loop-Graph/Loop-Digraph

Definition
A loop-digraph is a directed graph which allows an arc to start and end at the same vertex:


 * LoopDigraph.png

Also see

 * Loop-Digraph as a Relation: It can be seen by direct comparison that a loop-digraph is the same thing as a relational structure.


 * Definition:Hasse Diagram: a depiction of an ordered set as a loop-digraph with a stylised representation such that:
 * the loops are not shown
 * relation arising as a result of transitivity are not shown
 * directions are not shown by writing arrows on the arcs, but by positioning destination vertices higher on the page.