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Contraction-free sequent calculi for intuitionistic logic. (English) Zbl 0761.03004

J. Symb. Log. 57, No. 3, 795-807 (1992); correction ibid. 83, No. 4, 1680-1682 (2018).
As the author points out, the present article may be regarded in part as a restatement of relatively old work by N. N. Vorob’ev [Dokl. Akad. Nauk SSSR, N. Ser. 85, 689-692 (1952; Zbl 0047.252)]. It provides familiar reduction of the contraction rule for the intuitionistic propositional calculus to its instances combined with the rule for implications in the antecedent:
\(B,A,\Gamma\Rightarrow G/A\supset B,A,\Gamma\Rightarrow G\) for atomic \(A\);
\(C\supset(D\supset B)\), \(\Gamma\Rightarrow G/(C\& D)\supset B\), \(\Gamma\Rightarrow G\);
\(C\supset B\), \(D\supset B\), \(\Gamma\Rightarrow G/(C\lor D)\supset B\), \(\Gamma\Rightarrow G\);
\(D\supset B\), \(\Gamma\Rightarrow C\supset D\quad B,\Gamma\Rightarrow G/(C\supset D)\supset B\), \(\Gamma\Rightarrow G\).
Similar modifications of natural deduction are also presented.
Reviewer: G.Mints (Stanford)

MSC:

03B20 Subsystems of classical logic (including intuitionistic logic)
03F05 Cut-elimination and normal-form theorems

Citations:

Zbl 0047.252
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References:

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