Classical and Intuitionistic Models of Arithmetic

Notre Dame Journal of Formal Logic 37 (3):452-461 (1996)
Given a classical theory T, a Kripke model K for the language L of T is called T-normal or locally PA just in case the classical L-structure attached to each node of K is a classical model of T. Van Dalen, Mulder, Krabbe, and Visser showed that Kripke models of Heyting Arithmetic (HA) over finite frames are locally PA, and that Kripke models of HA over frames ordered like the natural numbers contain infinitely many PA-nodes. We show that Kripke models of the latter sort are in fact PA-normal. This result is extended to a somewhat larger class of frames.
Keywords Heyting Arithmetic  Kripke models  intuitionistic logic
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DOI 10.1305/ndjfl/1039886521
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