Abstract
In [2] A. Wroński proved that there is a strongly finite consequence C which is not finitely based i.e. for every consequence C + determined by a finite set of standard rules C ≠ C +. In this paper it will be proved that for every strongly finite consequence C there is a consequence C + determined by a finite set of structural rules such that C(Ø)=C +(Ø) and \(\bar C\)=\(\bar C\) (where \(\bar C\), \(\bar C\) are consequences obtained by adding to the rules of C, C + respectively the rule of substitution). Moreover it will be shown that under certain assumptions C=C +.
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References
R. Wójcicki, Strongly finite sentential calculi, in: Selected Papers on Lukasiewicz Sentential Calculi, Wrocław, 1977.
A. Wroński, On finitely based consequence operations, Studia Logica 35 (1976), pp. 453–458.
A. Wroński, On the depth of a consequence operation, Bulletin of the Section of Logic, Vol. 6, No. 3 (1977), pp. 96–101.
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Dywan, Z. Finite structural axiomatization of every finite-valued propositional calculus. Stud Logica 39, 1–4 (1980). https://doi.org/10.1007/BF00373093
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DOI: https://doi.org/10.1007/BF00373093