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ISBN: 978-0-7695-3507-4
pp: 743-747
A clause set is renamable Horn if the result replacing part propositional variable with its complement is a set of Horn clauses. The renamable Horn problem is solvable in linear time, but the maximum renamable Horn problem (MAX-RHS) is NP-hard. In this paper, we present transformations between clause sets and undirected graphs in polynomial time, such that finding a renamable Horn subset of a clause set is equivalent to finding an independent set of vertices of a graph. Then, the problems MAX-RHS and MAX-IND have the same complexity, and MAX-RHS is inapproximable.
maximum renamable Horn set, maximum independent set, polynomial transformation, NP-Hardness, inapproximability
Yongbin Qin, Daoyun Xu, "Maximum Renamable Horn and Maximum Independent Sets", CSIE, 2009, Computer Science and Information Engineering, World Congress on, Computer Science and Information Engineering, World Congress on 2009, pp. 743-747, doi:10.1109/CSIE.2009.690
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