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EXTENDED FRAMES AND SEPARATIONS OF LOGICAL PRINCIPLES
Published online by Cambridge University Press: 26 July 2023
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.
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- © The Author(s), 2023. Published by Cambridge University Press on behalf of The Association for Symbolic Logic
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