Arc Tail
# Definition
Let $G = (V, E)$ be a Directed Graph and let $(u, v) \in E$ be an arc. Then the Arc Head of $(u, v)$ is $t((u, v)) = v$.
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Let $G = (V, E)$ be a Directed Graph and let $(u, v) \in E$ be an arc. Then the Arc Head of $(u, v)$ is $t((u, v)) = v$.