Algebra universalis

, Volume 75, Issue 1, pp 75–84 | Cite as

CSP for binary conservative relational structures

  • Alexandr KazdaEmail author


We prove that whenever \({\mathbb {A}}\) is a 3-conservative relational structure with only binary and unary relations, then the algebra of polymorphisms of \({\mathbb {A}}\) either has no Taylor operation (i.e., CSP(\({\mathbb {A}}\)) is NP-complete), or it generates an SD(\({\wedge}\)) variety (i.e., CSP(\({\mathbb {A}}\)) has bounded width).

2010 Mathematics Subject Classification

Primary: 08A02 Secondary: 03C05 68R05 

Key words and phrases

meet-semidistributivity clone constraint satisfaction problem weak near unanimity 


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Copyright information

© Springer International Publishing 2015

Authors and Affiliations

  1. 1.IST AustriaKlosterneuburgAustria

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