Craig interpolation theorem for intuitionistic logic and extensions Part III
Craig interpolation theorem for intuitionistic logic and extensions Part III
复制标题
直觉逻辑的克雷格插值定理及其扩展第三部分
DOI:
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发表时间:
1977
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通讯作者:
D. Gabbay
中科院分区:
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作者:
D. Gabbay
This is a continuation of two previous papers by the same title [2] and examines mainly the interpolation property for the logic CD with constant domains, i.e., the extension of the intuitionistic predicate logic with the schema It is known [3], [4] that this logic is complete for the class of all Kripke structures with constant domains. Theorem 47. The strong Robinson consistency theorem is not true for CD. Proof. Consider the following Kripke structure with constant domains. The set S of possible worlds is ω0, the set of positive integers. R is the natural ordering ≤. Let ω0 0 = , Bn, is a sequence of pairwise disjoint infinite sets. Let L0 be a language with the unary predicates P, P1 and consider the following extensions for P,P1 at the world m. (a) P is true on ⋃i≤2nBi, and P1 is true on ⋃i≤2n+1Bi for m = 2n. (b) P is true on ⋃i≤2nBi, and P1 for ⋃i≤2n+1Bi for m = 2n. Let (Δ,Θ) be the complete theory of this structure. Consider another unary predicate Q. Let L be the language with P, Q and let M be the language with P1, Q.