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EXTENDED FRAMES AND SEPARATIONS OF LOGICAL PRINCIPLES

Published online by Cambridge University Press:  26 July 2023

MAKOTO FUJIWARA
Affiliation:
DEPARTMENT OF APPLIED MATHEMATICS FACULTY OF SCIENCE DIVISION I, TOKYO UNIVERSITY OF SCIENCE 1-3 KAGURAZAKA, SHINJUKU-KU TOKYO 162-8601, JAPAN E-mail: makotofujiwara@rs.tus.ac.jp
HAJIME ISHIHARA
Affiliation:
SCHOOL OF INFORMATION SCIENCE JAPAN ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY 1-1 ASAHIDAI, NOMI ISHIKAWA 923-1292, JAPAN E-mail: ishihara@jaist.ac.jp
TAKAKO NEMOTO
Affiliation:
GRADUATE SCHOOL OF INFORMATION SCIENCES TOHOKU UNIVERSITY 6-3-09 AOBA, ARAMAKI-AZA AOBA-KU SENDAI 980-8579, JAPAN E-mail: nemototakako@gmail.com
NOBU-YUKI SUZUKI
Affiliation:
DEPARTMENT OF MATHEMATICS FACULTY OF SCIENCE, SHIZUOKA UNIVERSITY OHYA 836, SURUGA-KU SHIZUOKA 422-8529, JAPAN E-mail: suzuki.nobuyuki@shizuoka.ac.jp
KEITA YOKOYAMA
Affiliation:
MATHEMATICAL INSTITUTE TOHOKU UNIVERSITY 6-3 ARAMAKI AZA-AOBA, AOBA-KU SENDAI 980-8578, JAPAN E-mail: keita.yokoyama.c2@tohoku.ac.jp

Abstract

We aim at developing a systematic method of separating omniscience principles by constructing Kripke models for intuitionistic predicate logic $\mathbf {IQC}$ and first-order arithmetic $\mathbf {HA}$ from a Kripke model for intuitionistic propositional logic $\mathbf {IPC}$. To this end, we introduce the notion of an extended frame, and show that each IPC-Kripke model generates an extended frame. By using the extended frame generated by an IPC-Kripke model, we give a separation theorem of a schema from a set of schemata in $\mathbf {IQC}$ and a separation theorem of a sentence from a set of schemata in $\mathbf {HA}$. We see several examples which give us separations among omniscience principles.

Type
Articles
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of The Association for Symbolic Logic

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