PP-2014-06: Positive Formulas in Intuitionistic and Minimal Logic

PP-2014-06: de Jongh, Dick and Zhao, Zhiguang (2014) Positive Formulas in Intuitionistic and Minimal Logic. [Report]

[thumbnail of Full Text]
Preview
Text (Full Text)
PP-2014-06.text.pdf

Download (366kB) | Preview
[thumbnail of Abstract] Text (Abstract)
PP-2014-06.abstract.txt

Download (1kB)

Abstract

In this article we investigate the positive, i.e.\ $\neg,\bot$-free formulas of intuitionistic propositional and predicate logic, IPC and IQC, and minimal logic, MPC and MQC. For each formula $\varphi$ of IQC we define the positive formula $\varphi^+$ that represents the positive content of $\varphi$. The formulas $\varphi$ and $\varphi^+$ exhibit the same behavior on top models, models with a largest world that makes all atomic sentences true. We characterize the positive formulas of IPC and IQC as the formulas that are immune to the operation of turning a model into a top model. With the +-operation we show, using the uniform interpolation theorem for IPC, that both the positive fragment of IPC and MPC respect a revised version of uniform interpolation. In propositional logic the well-known theorem that KC is conservative over the positive fragment of IPC is shown to generalize to many logics with positive axioms. In first-order logic, we show that IQC + DNS (double negation shift) + KC is conservative over the positive fragment of IQC and similar results as for IPC.

Item Type: Report
Report Nr: PP-2014-06
Series Name: Prepublication (PP) Series
Year: 2014
Uncontrolled Keywords: intuitionistic logic; minimal logic; Jankov's logic; intermediate logics; positive formulas; interpolation; conservativity
Subjects: Logic
Date Deposited: 12 Oct 2016 14:37
Last Modified: 12 Oct 2016 14:37
URI: https://eprints.illc.uva.nl/id/eprint/494

Actions (login required)

View Item View Item