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Predicate provability logic with non-modalized quantifiers
Authors:Giorgie Dzhaparidze
Affiliation:(1) Academy of Sciences of Georgian SSR, Institute of Philosophy, Roustaveli Av. 29, 380009 Tbilisi, USSR
Abstract:Predicate modal formulas with non-modalized quantifiers (call them Qprime-formulas) are considered as schemata of arithmetical formulas, where squ is interpreted as the provability predicate of some fixed correct extension T of arithmetic. A method of constructing 1) non-provable in T and 2) false arithmetical examples for Qprime-formulas by Kripke-like countermodels of certain type is given. Assuming the means of T to be strong enough to solve the (undecidable) problem of derivability in QprimeGL, the Qprime-fragment of the predicate version of the logic GL, we prove the recursive enumerability of the sets of Qprime-formulas all arithmetical examples of which are: 1) T-provable, 2) true. In. particular, the first one is shown to be exactly QprimeGL and the second one to be exactly the Qprime-fragment of the predicate version of Solovay's logic S.
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