Introduction1 Background2 Comparing NJ with LJ3 Natural Deduction Revisited4 The Problem of Substitution5 A Multiple-Conclusion Calculus6 Reduction Procedures7 Correspondence Results8 Interpretations of DerivationsAppendicesA. A Strong Cut-Elimination Theorem for LJB. A Formulation of the Classical Sequent CalculusC. Proofs and Categories
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