Notre Dame Journal of Formal Logic
- Notre Dame J. Formal Logic
- Volume 40, Number 1 (1999), 81-93.
Which Modal Logic Is the Right One?
The question, "Which modal logic is the right one for logical necessity?," divides into two questions, one about model-theoretic validity, the other about proof-theoretic demonstrability. The arguments of Halldén and others that the right validity argument is S5, and the right demonstrability logic includes S4, are reviewed, and certain common objections are argued to be fallacious. A new argument, based on work of Supecki and Bryll, is presented for the claim that the right demonstrability logic must be contained in S5, and a more speculative argument for the claim that it does not include S4.2 is also presented.
Notre Dame J. Formal Logic Volume 40, Number 1 (1999), 81-93.
First available in Project Euclid: 5 December 2002
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Burgess, John P. Which Modal Logic Is the Right One?. Notre Dame J. Formal Logic 40 (1999), no. 1, 81--93. doi:10.1305/ndjfl/1039096306. https://projecteuclid.org/euclid.ndjfl/1039096306