The Complexity of Gentzen Systems for Propositional Logic
The Complexity of Gentzen Systems for Propositional Logic
复制标题
命题逻辑 Gentzen 系统的复杂性
DOI:
10.1016/0304-3975(89)90147-3
复制
发表时间:
1989
期刊:
影响因子:
--
通讯作者:
A. Urquhart
中科院分区:
文献类型:
--
作者:
A. Urquhart
Examples are given of valid sequents of classical propositional logic involving only the biconditional which require exponentially long proofs in a cut-free Gentzen system. The sequents have polynomial size proofs if the cut rule is allowed.