Author

Grigory K. Olkhovikov

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Preprint Jul 2026

Definable Classes of Models and Frames in Bi-intuitionistic Logic

The question of the expressive power of a given logical language with Kripke relational semantics has at least two dimensions: (1) what the language can say about frames, and (2) what it can say about models. The Goldblatt-Thomason theorem provides a model-theoretic characterisation of modal axiomatisability for elemen...

Guillermo Badia, Tomasz Kowalski, Grigory K. Olkhovikov · 0 citations