A deduction theorem schema for deductive
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Janusz Czelakowski; Wiesลaw Dziobiak
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Article
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1991
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Springer Netherlands
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English
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We propose a new schema for the deduction theorem and prove that the deductive system S of a propositional logic L fulfills the proposed schema if and only if there exists a finite set A(p, q) of propositional formulae involving only propositional letters p and q such that A(p, p) C\_ L and p, A(p,