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  1. Fusion of sequent modal logic systems labelled with truth values.João Rasga, Karina Roggia & Cristina Sernadas - 2010 - Logic Journal of the IGPL 18 (6):893-920.
    Fusion is a well-known form of combining normal modal logics endowed with a Hilbert calculi and a Kripke semantics. Herein, fusion is studied over logic systems using sequent calculi labelled with truth values and with a semantics based on a two-sorted algebra allowing, in particular, the representation of general Kripke structures. A wide variety of logics, including non-classical logics like, for instance, modal logics and intuitionistic logic can be presented by logic systems of this kind. A categorical approach of fusion (...)
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  • Sufficient conditions for cut elimination with complexity analysis.João Rasga - 2007 - Annals of Pure and Applied Logic 149 (1-3):81-99.
    Sufficient conditions for first-order-based sequent calculi to admit cut elimination by a Schütte–Tait style cut elimination proof are established. The worst case complexity of the cut elimination is analysed. The obtained upper bound is parameterized by a quantity related to the calculus. The conditions are general enough to be satisfied by a wide class of sequent calculi encompassing, among others, some sequent calculi presentations for the first order and the propositional versions of classical and intuitionistic logic, classical and intuitionistic modal (...)
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