Question: Let G = ( V , E ) be a directed graph. After algorithm DFS ( G ) has terminated, each vertex has a pre

Let G =(V,E) be a directed graph. After algorithm DFS(G) has terminated,
each vertex has a pre- and post-number. Let u and v be two distinct vertices in V . Assume
that both of the following are true:
There is a directed path in G from u to v.
pre(u)< pre(v).
Professor Lionel Messi claims that, in the DFS-forest, v must be in the subtree of u.
Is Professor Messis claim correct? As always, justify your answer.

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