Abstract
We give a new characterization of series-parallel graphs which implies that the maximum integer multiflow is equal to the minimum capacity multicut if G + H is series-parallel, where G + H denotes the union of the support graph G and the demand graph H . We investigate the difference between a result of the type “the cut-condition is sufficient for the existence of a multiflow in some class” and a result of the type “max-multiflow = min-multicut for some class”.
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