First non-labelled sequent calculi for CS, CSM, and ER bimodal provability logics, with cut-elimination via non-wellfounded rules and uniform Lyndon interpolation.
Elsevier, 1997
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Proof Theory for Bimodal Provability Logics
First non-labelled sequent calculi for CS, CSM, and ER bimodal provability logics, with cut-elimination via non-wellfounded rules and uniform Lyndon interpolation.