Question: (20 Points) Let G be an undirected connected graph and T its DFS tree. Let v be a non-root vertex of T. Prove that v

(20 Points) Let G be an undirected connected graph and T

(20 Points) Let G be an undirected connected graph and T its DFS tree. Let v be a non-root vertex of T. Prove that v is a cut vertex of G if and only if v has a child s such that there is no back edge from s or any descendant of s to a proper ancestor of v

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