We develop canonical rules capable of axiomatizing all systems of
multiple-conclusion rules over K4 or IPC, by extension of the
method of canonical formulas by Zakharyaschev [37]. We
use the framework to give an alternative proof of the known analysis
of admissible rules in basic transitive logics, which additionally
yields the following dichotomy: any canonical rule is either
admissible in the logic, or it is equivalent to an assumption-free
rule. Other applications of canonical rules include a generalization
of the Blok—Esakia theorem and the theory of modal companions to
systems of multiple-conclusion rules or (finitary structural global)
consequence relations, and a characterization of splittings in the
lattices of consequence relations over monomodal or
superintuitionistic logics with the finite model property.
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