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Normal Form Theorem for Systems of Sequents
Publications de l'Institut Mathématique, _N_S_82 (2007) no. 96, p. 37 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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In a system of sequents for intuitionistic predicate logic a theorem, which corresponds to Prawitz's Normal Form Theorem for natural deduction, are proved. In sequent derivations a special kind of cuts, maximum cuts, are defined. Maximum cuts from sequent derivations are connected with maximum segments from natural deduction derivations, i.e., sequent derivations without maximum cuts correspond to normal derivations in natural deduction. By that connection the theorem for the system of sequents (which correspond to Normal Form Theorem for natural deduction) will have the following form: for each sequent derivation whose end sequent is $\Gamma\vdash A$ there is a sequent derivation without maximum cuts whose end sequent is $\Gamma\vdash A$.
DOI : 10.2298/PIM0796037B
Classification : 03F05
Keywords: cut-elimination theorem, normalization theorem 
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Mirjana Borisavljević. Normal Form Theorem for Systems of Sequents. Publications de l'Institut Mathématique, _N_S_82 (2007) no. 96, p. 37 . doi: 10.2298/PIM0796037B

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