Uniform Lyndon interpolation is shown for GLS via non-wellfounded proofs, closing a prior gap and yielding an alternative cut-elimination proof.
Solovay (1976): Provability interpretations of modal logic
3 Pith papers cite this work. Polarity classification is still indexing.
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A linearization method enables a PSPACE proof-search algorithm for GL on labeled tree sequents, with counter-model extraction from failed searches and a reduction to linear nested sequents.
Complete classification of additive and normal formulas in modal logics K, GL, Grz, S4, and S5 for diamond interpretations, with parameter versions for K, GL, and S5.
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On Interpretations of Normal Modal Logics
Complete classification of additive and normal formulas in modal logics K, GL, Grz, S4, and S5 for diamond interpretations, with parameter versions for K, GL, and S5.