## Proof theory for admissible rules.(English)Zbl 1174.03024

The paper is a contribution to the study of admissible rules of nonclassical propositional logics. A rule (closed under substitution) is admissible in a logic if the set of its theorems is closed under the rule. Admissibility was shown to be decidable in a variety of normal modal and superintuitionistic logics by V. V. Rybakov [Admissibility of logical inference rules. Amsterdam: Elsevier (1997; Zbl 0872.03002)]. Explicit bases of admisible rules were constructed for some superintuitionistic logics by R. Iemhoff [J. Symb. Log. 66, No. 1, 281–294 (2001; Zbl 0986.03013); Notre Dame J. Formal Logic 46, No. 1, 65–81 (2005; Zbl 1102.03032)] and for some modal logics by E. Jeřábek [J. Log. Comput. 15, No. 4, 411–431 (2005; Zbl 1077.03011)], drawing on the work of S. Ghilardi [J. Symb. Log. 64, No. 2, 859–880 (1999; Zbl 0930.03009); Ann. Pure Appl. Logic 102, No. 3, 183–198 (2000; Zbl 0949.03010)] on projective formulas.
In the paper under review, the authors present a proof-theoretic treatment of admissible rules. They introduce certain analytic calculi operating with multiple-conclusion rules consisting of Gentzen-style sequents of formulas, and show their completeness for admissibility in a class of modal logics and in intuitionistic logic.

### MSC:

 03F07 Structure of proofs 03B20 Subsystems of classical logic (including intuitionistic logic) 03B45 Modal logic (including the logic of norms)
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### References:

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