
doi: 10.2307/2275149
handle: 11383/8649
AbstractA proof is given that the set of maximal intermediate propositional logics with the disjunction property and the set of maximal intermediate predicate logics with the disjunction property and the explicit definability property have the power of continuum. To prove our results, we introduce various notions which might be interesting by themselves. In particular, we illustrate a method to generate wide sets of pairwise “constructively incompatible constructive logics”. We use a notion of “semiconstructive” logic and define wide sets of “constructive” logics by representing the “constructive” logics as “limits” of decreasing sequences of “semiconstructive” logics. Also, we introduce some generalizations of the usual filtration techniques for propositional logics. For instance, “fitrations over rank formulas” are used to show that any two different logics belonging to a suitable uncountable set of “constructive” logics are “constructively incompatible”.
explicit definability property, disjunction property, intermediate predicate logic, intermediate propositional logic, maximal intermediate logics, Intermediate logics
explicit definability property, disjunction property, intermediate predicate logic, intermediate propositional logic, maximal intermediate logics, Intermediate logics
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