Abstract
We give a new proof of the following result (originally due to Linial and Post): it is undecidable whether a given calculus, that is a finite set of propositional formulas together with the rules of modus ponens and substitution, axiomatizes the classical logic. Moreover, we prove the same for every superintuitionistic calculus. As a corollary, it is undecidable whether a given calculus is consistent, whether it is superintuitionistic, whether two given calculi have the same theorems, whether a given formula is derivable in a given calculus. The proof is by reduction from the undecidable halting problem for the so-called tag systems introduced by Post. We also give a historical survey of related results.
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Zolin, E. Undecidability of the Problem of Recognizing Axiomatizations of Superintuitionistic Propositional Calculi. Stud Logica 102, 1021–1039 (2014). https://doi.org/10.1007/s11225-013-9520-5
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DOI: https://doi.org/10.1007/s11225-013-9520-5