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arxiv: 1112.1099 · v2 · pith:NMZ2XQVTnew · submitted 2011-12-05 · 🧮 math.CO

CSP for binary conservative relational structures

classification 🧮 math.CO
keywords binaryconservativerelationalalgebraboundedcongruenceeithergenerates
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We prove that whenever A is a 3-conservative relational structure with only binary and unary relations then the algebra of polymorphisms of A either has no Taylor operation (i.e. CSP(A) is NP-complete), or generates a congruence meet semidistributive variety (i.e. CSP(A) has bounded width).

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