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Canonical rules. (English) Zbl 1186.03045
One of Friedman’s famous problems [see H. Friedman, J. Symb. Log. 40, 113–129 (1975; Zbl 0318.02002)] was whether admissibility of rules in intuitionistic logic is decidable. This problem was investigated seriously by Rybakov, whose results on admissibility are summarized in his book [V. V. Rybakov, Admissibility of logical inference rules. Studies in Logic and the Foundations of Mathematics. 136. Amsterdam: Elsevier (1997; Zbl 0872.03002)]. On the other hand, the concept of multiple-conclusion rules [D. J. Shoesmith and T. J. Smiley, Multiple-conclusion logic. Cambridge: Cambridge University Press (1978; Zbl 0381.03001); B. Boričić, J. Philos. Logic 14, 359–377 (1985; Zbl 0572.03033), Notre Dame J. Formal Logic 29, No. 4, 563–568 (1988; Zbl 0668.03010)] was developed in order to get an appropriate context for treating normalization in natural deduction for classical and superintuitionistic systems.
In this paper, the author develops certain frame-based multiple-conclusion rules, called the canonical rules, and establishes that every system of rules extending the modal logic K4 or Heyting propositional logic IPC can be axiomatized by canonical rules. The author applies this approach to admissible rules of basic transitive or linearly ordered logics (K4, S4, GL, IPC, K4.3, S4.3, GL.3) as well as all logics inheriting their admissible rules. It is shown that, for these logics, there exists a simple combinatorial criterion to recognize which canonical rules are admissible. An alternative proof of decidability of admissibility in each of these systems is obtained in this way, as well as a description of a basis of admissible rules. A new result, a dichotomy property, about admissible rules in these logics can be formulated as follows: every canonical rule is either admissible or equivalent to a rule without assumptions. The canonical rules are used to develop the theory of modal companions of intuitionistic rule systems and consequence relations, making it possible to get some of the well-known properties of modal companions of superintuitionistic logics. In the last section of the paper the author considers the generalization of canonical rules to nontransitive modal logics making it possible to give a description of splitting in the lattices of rule systems or consequence relations extending a given rule system with the finite model property. The canonical rules admissible in K are characterized, and a simple set of axioms from which they are derivable is presented.

03B45 Modal logic (including the logic of norms)
03B55 Intermediate logics
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