Given a digraph G = (V. F) and a root r in V, an arborescence (rooted at r) is a subgraph T= (V. F) such that
- T is a spanning tree of G if we ignore the direction of edges.
- There is a directed path in T from r to each other node v E
Given a digraph G = (V. F) and a root r in V, an arborescence (rooted at r) is a subgraph T= (V. F) such that