Definition:Out-Degree

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

Let $v \in V$ be a vertex of $G$.

The out-degree of $v$ in $G$ is the number of arcs which are incident from $v$.

It is denoted $\operatorname{outdeg}_G \left({v}\right)$, or just $\operatorname{outdeg} \left({v}\right)$ if it is clear from the context which graph is being referred to.