On the Proof Theory of Indexed Nested Sequents for Classical and Intuitionistic Modal Logics
Sonia Marin, Lutz Straßburger · HAL (Le Centre pour la Communication Scientifique Directe) · 2017
Fitting's indexed nested sequents can be used to give deductive systems to modal logics which cannot be captured by pure nested sequents. In this paper we show how the standard cut-elimination procedure for nested sequents can be extended to indexed nested sequents, and we discuss how indexed nested sequents can be used for intuitionistic modal logics.