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The Two Bicliques Problem is in NP intersection coNP

By M. A. Shalu and S. Vijayakumar


We show that the problem of deciding whether the vertex set of a graph can be covered with at most two bicliques is in NP$\cap$coNP. We thus almost determine the computational complexity of a problem whose status has remained open for quite some time. Our result implies that a polynomial time algorithm for the problem is more likely than it being NP-complete unless P = NP

Topics: Computer Science - Computational Complexity, Computer Science - Data Structures and Algorithms, Mathematics - Combinatorics
Year: 2011
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