## On the rules of intermediate logics.(English)Zbl 1096.03025

Summary: If the Visser rules are admissible for an intermediate logic, they form a basis for the admissible rules of the logic. How to characterize the admissible rules of intermediate logics for which not all of the Visser rules are admissible is not known. In this paper we give a brief overview of results on admissible rules in the context of intermediate logics. We apply these results to some well-known intermediate logics. We provide natural examples of logics for which the Visser rules are derivable, admissible but nonderivable, or not admissible.

### MSC:

 03B55 Intermediate logics
Full Text:

### References:

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