Definition:Loop-Graph/Loop-Digraph/Formal Definition
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Definition
A loop-digraph $D$ is a non-empty set $V$ together with a relation $E$ on $D$.
Thus it can be seen that a loop-digraph is a digraph with the stipulation that the relation $E$ does not need to be antireflexive.
Sources
- 1977: Gary Chartrand: Introductory Graph Theory ... (previous) ... (next): Chapter $1$: Mathematical Models: $\S 1.6$: Networks as Mathematical Models