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On the NP-hardness of approximating ordering-constraint satisfaction problems
KTH, Skolan för datavetenskap och kommunikation (CSC), Teoretisk datalogi, TCS.ORCID-id: 0000-0001-8217-0158
KTH, Skolan för datavetenskap och kommunikation (CSC), Teoretisk datalogi, TCS.
KTH, Skolan för datavetenskap och kommunikation (CSC), Teoretisk datalogi, TCS.
2015 (engelsk)Inngår i: Theory of Computing, E-ISSN 1557-2862, Vol. 11, s. 257-283Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We show improved NPNP-hardness of approximating Ordering-Constraint Satisfaction Problems (OCSPs). For the two most well-studied OCSPs, Maximum Acyclic Subgraph and Maximum Betweenness, we prove NPNP-hard approximation factors of 14/15+ε14/15+ε and 1/2+ε1/2+ε. When it is hard to approximate an OCSP by a constant better than taking a uniformly-at-random ordering, then the OCSP is said to be approximation resistant. We show that the Maximum Non-Betweenness Problem is approximation resistant and that there are width-mm approximation-resistant OCSPs accepting only a fraction 1/(m/2)! of assignments. These results provide the first examples of approximation-resistant OCSPs subject only to P≠NP.

sted, utgiver, år, opplag, sider
Theory of Computing Exchange , 2015. Vol. 11, s. 257-283
Emneord [en]
Acyclic subgraph, APPROX, Approximation, Approximation resistance, Betweenness, Constraint satisfaction, CSPs, Feedback arc set, Hypercontractivity, NP-completeness, Orderings, PCP, Probabilistically checkable proofs, Hardness, NP-hard, Feedback arc sets, Probabilistically checkable proof, Constraint satisfaction problems
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URN: urn:nbn:se:kth:diva-314134DOI: 10.4086/toc.2015.v011a010Scopus ID: 2-s2.0-85010635643OAI: oai:DiVA.org:kth-314134DiVA, id: diva2:1674004
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Not duplicate with DiVA 675596 which is a conference paper

QC 20220621

Tilgjengelig fra: 2022-06-21 Laget: 2022-06-21 Sist oppdatert: 2024-02-27bibliografisk kontrollert

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Austrin, PerManokaran, RajsekarWenner, Cenny

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