Abstract
Letw i ∶V ×V →Q,i = 1, 2 be two weight functions on the possible edges of a directed or undirected graph with vertex setV such that for the cut function, the inequality
holds for everyT ε 2V We consider the computation of the value λ(W 1,W 2,K) defined by
We show that the associated decision problem is NP-complete, but for a class of instances we can give a polynomial time algorithm. This class is closely related to the following bottleneck augmentation problem.
Consider a networkN = (V, E, c) with a rational valued capacity functionc∶ V ×V →Q +, and letk be a positive, rational number. Consider the problem of finding a capacity functionc′∶V ×V →Q + such that, in the resulting networkN′ = (V, E, c + c′) the edge connectivity number λc+c′, is at leastk, and the maximal increasec′(ij) is minimal.
We give an algorithm which computes such an augmentation in strongly polynomial time.
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Bussieck, M. On balanced edge connectivity and applications to some bottleneck augmentation problems in networks. Mathematical Methods of Operations Research 43, 183–194 (1996). https://doi.org/10.1007/BF01680371
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DOI: https://doi.org/10.1007/BF01680371