Abstract
We study axiomatic extensions of the propositional constructive logic with strong negation having the disjunction property in terms of corresponding to them varieties of Nelson algebras. Any such varietyV is characterized by the property: (PQWC) ifA,B εV, thenA×B is a homomorphic image of some well-connected algebra ofV.
We prove:
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each varietyV of Nelson algebras with PQWC lies in the fibre σ−1(W) for some varietyW of Heyting algebras having PQWC,
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for any varietyW of Heyting algebras with PQWC the least and the greatest varieties in σ−1(W) have PQWC,
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there exist varietiesW of Heyting algebras having PQWC such that σ−1(W) contains infinitely many varieties (of Nelson algebras) with PQWC.
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Sendlewski, A. Axiomatic extensions of the constructive logic with strong negation and the disjunction property. Stud Logica 55, 377–388 (1995). https://doi.org/10.1007/BF01057804
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DOI: https://doi.org/10.1007/BF01057804