2 papers
cs.LO2026
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…
math.LO2026
Interpolation above S4
Simon Santschi, Niels C. Vooijs
We complete Maksimova's classification of the normal extensions of S4 with interpolation. In particular, we prove Craig interpolation for the six extensions of S4 for which Craig i…