
doi: 10.1007/bf00373493
The aim of this note is to show (Theorem 1.6) that in each of the cases: ψ= {→, ∨ }, or {→, ∨, ∧ }, or {→, ∨, ℸ } there are uncountably many ψ-intermediate logics which are not finitely approximable. This result together with the results known in literature allow us to conclude (Theorem 2.2) that for each ψ: either all ψ-intermediate logics are finitely approximate or there are uncountably many of them which lack the property.
intuitionistic propositional logic, intermediate logics, Subsystems of classical logic (including intuitionistic logic), Intermediate logics
intuitionistic propositional logic, intermediate logics, Subsystems of classical logic (including intuitionistic logic), Intermediate logics
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