Question: Suppose that D = (V, A: c) is a flow network and f is a maximum s-t flow in D. Let U be a

Suppose that D = (V, A: c) is a flow network and f is a maximum s-t flow in D. Let U be a subset of V with sEUCV\{t}. Prove that sout (U) is a minimum s-t cut in D if and only if residual graph Df has no edge from U to V\U.

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