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math.LO2026
Most properties are undecidable even in
Qian Chen, Tenyo Takahashi
We investigate decidability of properties in the lattice of extensions of the Grzegorczyk tense logic and the lattice $\mat…
math.LO2025
Degree of Kripke-incompleteness of Tense Logics
Qian Chen
The degree of Kripke-incompleteness of a logic in some lattice of logics is the cardinality of logics in which share the same class of Kripke-frames…
math.LO2024
Pretabular Tense Logics over S4t
Qian Chen
A logic is called tabular if it is the logic of some finite frame and is pretabular if it is not tabular while all of its proper consistent extensions are tabular. In this…