David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
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Studia Logica 54 (1):79 - 88 (1995)
In [Ono 1987] H. Ono put the question about axiomatizing the intermediate predicate logicLFin characterized by the class of all finite Kripke frames (Problem 4,P41). It was established in [Skvortsov 1988] thatLFin is not recursively axiomatizable. One can easily show that for any finite posetM, the predicate logic characterized byM is recursively axiomatizable, and its axiomatization can be constructed effectively fromM. Namely, the set of formulas belonging to this logic is recursively enumerable, since it is embeddable in the two-sorted classical predicate calculusCPC 2 (the definition of the truth in a Kripke model may be expressed by a formula ofCPC 2). Thus the logicLFin is II 2 0 -arithmetical.Here we give a more explicit II 2 0 -description ofLFin: it is presented as the intersection of a denumerable sequence of finitely axiomatizable Kripke-complete logics. Namely, we give an axiomatization of the logicLB n P m + characterized by the class of all posets of the finite height m and the finite branching n. A finite axiomatization of the predicate logicLP m + characterized by the class of all posets of the height m is known from [Yokota 1989] (this axiomatics is essentially first-order; the standard propositional axiom of the height m is not sufficient [Ono 1983]). We prove thatLB n P m + =(LP m + +B n),B n being the propositional axiom of the branching n (see [Gabbay, de Jongh 1974]).
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Dmitrij Skvortsov (2012). Kripke Sheaf Completeness of Some Superintuitionistic Predicate Logics with a Weakened Constant Domains Principle. Studia Logica 100 (1-2):361-383.
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