Question: Suppose that in a minimum cost flow problem, some arcs have infinite capacities and some arc costs are negative. ( Assume that the lower bounds

Suppose that in a minimum cost flow problem, some arcs have infinite capacities
and some arc costs are negative. (Assume that the lower bounds on all arc flows are zero.)
Show that the minimum cost flow problem has a finite optimal solution if and only if the uncapacitated
arcs do not contain a negative cost-directe

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