Abstract
We prove hardness results for approximating set splitting problems and also instances of satisfiability problems which have no “mixed” clauses, i.e., every clause has either all its literals unnegated or all of them negated. Results of Håstad [9] imply tight hardness results for set splitting when all sets have size exactly k ≥ 4 elements and also for non-mixed satisfiability problems with exactly k literals in each clause for k ≥ 4. We consider the case k = 3. For the Max E3-Set Splitting problem in which all sets have size exactly 3, we prove an NP-hardness result for approximating within any factor better than 19/20. This result holds even for satisfiable instances of Max E3-Set Splitting, and is based on a PCP construction due to Håstad [9]. For “non mixed Max 3Sat”, we give a PCP construction which is a variant of one in [8] and use it to prove the NP-hardness of approximating within a factor better than 11/12, and also a hardness factor of 15/16 + ε (for any ε > 0) for the version where each clause has exactly 3 literals (as opposed to up to 3 literals).
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
G. Andersson and L. Engebretsen. Better approximation algorithms for Set Splitting and Not-All-Equal Sat. Information Processing Letters, 65:305–311, 1998.
M. Bellare, O. Goldreich and M. Sudan. Free bits, PCP’s and non-approximability-towards tight results. SIAM Journal on Computing, 27(3):804–915, 1998. Preliminary version in Proc. of FOCS’95.
P. Crescenzi, R. Silvestri and L. Trevisan. To weight or not to weight: Where is the question? Proc. of 4th Israel Symposium on Theory of Computing and Systems, pp. 68–77, 1996.
U. Feige and M. Goemans. Approximating the value of two prover proof systems, with applications to MAX-2SAT and MAX-DICUT. Proc. of the 3rd Israel Symposium on Theory and Computing Systems, Tel Aviv, pp. 182–189, 1995.
M. Goemans and D. Williamson. Improved approximation algorithms for maximum cut and satisfiability problems using semidefinite programming. Journal of the ACM, 42:1115–1145, 1995.
V. Guruswami. The approximability of set splitting problems and satisfiability problems with no mixed clauses. ECCC Technical Report TR-99-043, 1999.
V. Guruswami. Query-efficient Checking of Proofs and Improved PCP Characterizations of NP. S.M Thesis, MIT, May 1999.
V. Guruswami, D. Lewin, M. Sudan and L. Trevisan. A tight characterization of NP with 3 query PCPs. ECCC Technical Report TR98-034, 1998. Preliminary Version in Proc. of FOCS’98.
J. Håstad Some optimal inapproximability results. ECCC Technical Report TR97-37, 1997. Preliminary version in Proc. of STOC’97.
V. Kann, J. Lagergren and A. Panconesi. Approximability of maximum splitting of k-sets and some other APX-complete problems. Information Processing Letters, 58:105–110, 1996.
H. Karlo. and U. Zwick. A (7/8-ε)-approximation algorithm for MAX 3SAT? In Proceedings of the 38th FOCS, 1997.
S. Khanna, M. Sudan and D. Williamson. A complete classification of the approximability of maximization problems derived from Boolean constraint satisfaction. Proc. of the 29th STOC, 1997.
L. Lovász. Coverings and colorings of hypergraphs. Proc. 4th Southeastern Conf. on Combinatorics, Graph Theory, and Computing, pp. 3–12, Utilitas Mathematica Publishing, Winnipeg, 1973.
E. Petrank. The hardness of approximation: Gap location. Computational Complexity, 4:133–157, 1994.
R. Raz. A parallel repetition theorem. SIAM Journal on Computing, 27(3):763–803, 1998. Preliminary version in Proc. of STOC’95.
L. Trevisan, G. Sorkin, M. Sudan and D. Williamson. Gadgets, approximation and linear programming. Proceedings of the 37th FOCS, pp. 517–626, 1996.
U. Zwick. Approximation algorithms for constraint satisfaction problems involving at most three variables per constraint. In Proceedings of the 9th ACM-SIAM Symposium on Discrete Algorithms, 1998.
U. Zwick. Outward rotations: a tool for rounding solutions of semidefinite programming relaxations, with applications to MAX CUT and other problems. In Proceedings of STOC’99.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2000 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Guruswami, V. (2000). Inapproximability Results for Set Splitting and Satisfiability Problems with No Mixed Clauses. In: Jansen, K., Khuller, S. (eds) Approximation Algorithms for Combinatorial Optimization. APPROX 2000. Lecture Notes in Computer Science, vol 1913. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44436-X_16
Download citation
DOI: https://doi.org/10.1007/3-540-44436-X_16
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-67996-7
Online ISBN: 978-3-540-44436-7
eBook Packages: Springer Book Archive