Approximating directed multicuts

Joseph Cheriyan, Howard Karloff, Yuval Rabani

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


The seminal paper of Leighton and Rao (1988) and subsequent papers presented approximate min-max theorems relating multicommodity flow values and cut capacities in undirected networks, developed the divide-and-conquer method for designing approximation algorithms, and generated novel tools for utilizing linear programming relaxations. Yet, despite persistent research efforts, these achievements could not be extended to directed networks, excluding a few cases that are "symmetric" and therefore similar to undirected networks. This paper is an attempt to remedy the situation. We consider the problem of finding a minimum multicut in a directed multicommodity flow network, and give the first nontrivial upper bounds on the max flow-to-min multicut ratio. Our results are algorithmic, demonstrating nontrivial approximation guarantees.

Original languageAmerican English
Pages (from-to)320-328
Number of pages9
JournalAnnual Symposium on Foundations of Computer Science - Proceedings
StatePublished - 2001
Externally publishedYes


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