The simple substitution property of GΓΆde
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Katsumi Sasaki
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Article
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1990
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Springer Netherlands
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English
β 480 KB
The simple substitution property provides a systematic and easy method for proving a theorem from the additional axioms of intermediate propositional logics. There have been known only four intermediate logics that have the additional axioms with the property. In this paper, we reformulate the many