Concept

# Cut-elimination theorem

Summary
The cut-elimination theorem (or Gentzen's Hauptsatz) is the central result establishing the significance of the sequent calculus. It was originally proved by Gerhard Gentzen in his landmark 1934 paper "Investigations in Logical Deduction" for the systems LJ and LK formalising intuitionistic and classical logic respectively. The cut-elimination theorem states that any judgement that possesses a proof in the sequent calculus making use of the cut rule also possesses a cut-free proof, that is, a proof that does not make use of the cut rule. The cut rule A sequent is a logical expression relating multiple formulas, in the form "A_1, A_2, A_3, \ldots \vdash B_1, B_2, B_3, \ldots", which is to be read as "A_1, A_2, A_3, \ldots proves B_1, B_2, B_3, \ldots", and (as glossed by Gentzen) should be understood as equivalent to the truth-function "If (A_1
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