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The syntax and semantics of entailment in duality theory

Published online by Cambridge University Press:  12 March 2014

B. A. Davey ,
M. Haviar  and
H. A. Priestley
B. A. Davey
Affiliation:
Department of Mathematics, La Trobe University, Bundoora, Victoria 3083, Australia, E-mail: [email protected]
M. Haviar
Affiliation:
Department of Mathematics, M. Bel University, Zvolenska Cesta 6, 974 01 Banska Bystrica, Slovakia, E-mail: [email protected]
H. A. Priestley
Affiliation:
Mathematical Institute, 24/29 St Giles, Oxford OX1 3LB, England, E-mail: [email protected]
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Abstract

Both syntactic and semantic solutions are given for the entailment problem of duality theory. The test algebra theorem provides both a syntactic solution to the entailment problem in terms of primitive positive formula and a new derivation of the corresponding result in clone theory, viz. the syntactic description of Inv(Pol(R)) for a given set R of unitary relations on a finite set. The semantic solution to the entailment problem follows from the syntactic one, or can be given in the form of an algorithm. It shows, in the special case of a purely relational type, that duality-theoretic entailment is describable in terms of five constructs, namely trivial relations, intersection, repetition removal, product, and retractive projection. All except the last are concrete, in the sense that they are described by a quantifier-free formula. It is proved that if the finite algebra M generates a congruence-distributive variety and all subalgebras of M are subdirectly irreducible, then concrete constructs suffice to describe entailment. The concept of entailment appropriate to strong dualities is also introduced, and described in terms of coordinate projections, restriction of domains, and composition of partial functions.

Keywords

Primary 08B9903C9918A40Natural dualitycloneentailmentsyntaxsemantics
Type
Research Article
Information
The Journal of Symbolic Logic , Volume 60 , Issue 4 , December 1995 , pp. 1087 - 1114
Copyright
Copyright © Association for Symbolic Logic 1995

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References

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