A Problem of Normal Form in Natural Deduction

A Problem of Normal Form in Natural Deduction
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自然演绎中的范式问题

DOI:
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发表时间:
2000
影响因子:
0.3
通讯作者:
J. Plato
J. Plato
中科院分区:
数学4区
文献类型:
--
作者:
J. Plato

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最近埃克曼在自然演绎中给出了一个推导,它要么包含大量的冗余部分,要么不正常。它表明,这个问题是由一个非正常固有的通常的肯定前件规则。
Recently Ekman gave a derivation in natural deduction such that it either contains a substantial redundant part or else is not normal. It is shown that this problem is caused by a non-normality inherent in the usual modus ponens rule.