A Focused Approach to Combining Logics

Abstract : We present a compact sequent calculus LKU for classical logic organized around the concept of polarization. Focused sequent calculi for classical, intuitionistic, and multiplicative-additive linear logics are derived as fragments of the host system by varying the sensitivity of specialized structural rules to polarity information. We identify a general set of criteria under which cut elimination holds in such fragments. From cut elimination we derive a unified proof of the completeness of focusing. Furthermore, each sublogic can interact with other fragments through cut. We examine certain circumstances, for example, in which a classical lemma can be used in an intuitionistic proof while preserving intuitionistic provability. We also examine the possibility of defining classical-linear hybrid logics.
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Annals of Pure and Applied Logic, Elsevier Masson, 2011, 〈10.1016/j.apal.2011.01.012〉
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Chuck Liang, Dale Miller. A Focused Approach to Combining Logics. Annals of Pure and Applied Logic, Elsevier Masson, 2011, 〈10.1016/j.apal.2011.01.012〉. 〈hal-00772736〉

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