An infinitary extension of jankov's theorem

Studia Logica 86 (1):111 - 131 (2007)
Abstract
It is known that for any subdirectly irreducible finite Heyting algebra A and any Heyting algebra B, A is embeddable into a quotient algebra of B, if and only if Jankov’s formula χ A for A is refuted in B. In this paper, we present an infinitary extension of the above theorem given by Jankov. More precisely, for any cardinal number κ, we present Jankov’s theorem for homomorphisms preserving infinite meets and joins, a class of subdirectly irreducible complete κ-Heyting algebras and κ-infinitary logic, where a κ-Heyting algebra is a Heyting algebra A with # ≥ κ and κ-infinitary logic is the infinitary logic such that for any set Θ of formulas with # Θ ≥ κ, ∨Θ and ∧Θ are well defined formulas.
Keywords Philosophy   Computational Linguistics   Mathematical Logic and Foundations   Logic
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DOI 10.1007/s11225-007-9048-7
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A Logic Stronger Than Intuitionism.Sabine Görnemann - 1971 - Journal of Symbolic Logic 36 (2):249-261.
Conjunctively Indecomposable Formulas in Propositional Calculi.[author unknown] - 1972 - Journal of Symbolic Logic 37 (1):186-186.
A Proof of the Completeness Theorem of Godel.H. Rasiowa & R. Sikorski - 1952 - Journal of Symbolic Logic 17 (1):72-72.

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