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A Non-Wellfounded and Labelled Sequent Calculus for Bimodal Provability Logic (2506.14307v1)
Published 17 Jun 2025 in cs.LO and math.LO
Abstract: We present a labelled and non-wellfounded calculus for the bimodal provability logic CS. The system is obtained by modelling the Kripke-like semantics of this logic. As in arXiv:2309.00532, we enforce the second-order property of converse wellfoundedness by using techniques from cyclic proof theory. We will prove soundness and completeness of this system with respect to the semantics and provide a primitive decision procedure together with a way to extract countermodels.