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Clique in 3-track interval graphs is APX-hard (1204.2202v1)
Published 10 Apr 2012 in cs.CC and cs.DM
Abstract: Butman, Hermelin, Lewenstein, and Rawitz proved that Clique in t-interval graphs is NP-hard for t >= 3. We strengthen this result to show that Clique in 3-track interval graphs is APX-hard.