We use the apparatus of the canonical formulas introduced by Zakharyaschev [lo] to prove that all finitely axiomatizable normal modal logics containing K4.3 are decidable, though possibly not characterized by classes of finite frames. Our method is purely frame-theoretic. Roughly, given a normal log
โฆ LIBER โฆ
Hereditarily finitely axiomatizable extensions of logic S4
โ Scribed by V. V. Rybakov
- Publisher
- Springer US
- Year
- 1976
- Tongue
- English
- Weight
- 775 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0002-5232
No coin nor oath required. For personal study only.
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The aim of this article is to give a compact and self-contained description of the class of paraconsistent extensions of Johansson's (or minimal) logic (denoted Lj). The class of all non-trivial Lj-extensions is divided into three classes: the class Int of intermediate logics, the class Neg of negat