Bull's theorem by the method of diagrams

Studia Logica 62 (2):163-176 (1999)
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Abstract

We show how to use diagrams in order to obtain straightforward completeness theorems for extensions of K4.3 and a very simple and constructive proof of Bull's theorem: every normal extension of S4.3 has the finite model property.

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Giovanna Corsi
Università degli Studi di Bologna

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References found in this work

An ascending chain of S4 logics.Kit Fine - 1974 - Theoria 40 (2):110-116.
The Logics Containing S 4.3.Kit Fine - 1971 - Mathematical Logic Quarterly 17 (1):371-376.
That All Normal Extensions of S4.3 Have the Finite Model Property.R. A. Bull - 1966 - Mathematical Logic Quarterly 12 (1):341-344.

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