Definition:Directed Graph/Arc

Definition
Let $$G = \left({V, E}\right)$$ be a digraph.

The arcs are the elements of $$E$$.

Informally, an arc is a line that joins one vertex to another.

If $$e \in E$$ is an arc joining the vertex $$u$$ to the vertex $$v$$, it is denoted $$uv$$.

$$u$$ and $$v$$ are called the endvertices of $$e$$.