Logics Containing wK4: Selection à la Fine

Simon Santschi
Niels C. Vooijs

We generalize Fine's Iterative Selection Method to the weakly transitive setting. In particular, this provides a transparent frame-theoretic proof of the finite model property for (strongly) cofinal subframe logics extending wK4, which was previously established using algebraic methods. Using the same construction, we generalize Fine's Finite Width Theorem to the weakly transitive setting, connecting these two celebrated theorems of Fine.

In Marta Bílková, Malvin Gattinger, Iris van der Giessen, Marianna Girlando and Yanjing Wang: Proceedings of the Sixteenth International Conference on Advances in Modal Logic (AiML 2026), Amsterdam, The Netherlands, 29-06-2026, Electronic Proceedings in Theoretical Computer Science 447, pp. 674–690.
Published: 29th June 2026.

ArXived at: https://dx.doi.org/10.4204/EPTCS.447.38 bibtex PDF
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