\begin{definition}[Definition:Arborescence/Also defined as]
Some sources, for example {{BookReference|The Art of Computer Programming: Volume 1: Fundamental Algorithms||Donald E. Knuth}}, define an arborescence of root $r$ so as to reverse the orientation of $G$, so that the arcs are all directed toward the root rather than away from it.
Category:Definitions/Arborescences
\end{definition}