请输入您要查询的字词:

 

单词 contrapositive
释义
contrapositive

Mathematics
  • The contrapositive of an implication pq is the implication ¬q ⇒ ¬p. An implication and its contrapositive are logically equivalent, so that one is true if and only if the other is. For example, the theorem that if n2 is odd then n is odd could be proved by showing instead that if n is even then n2 is even.


Philosophy
  • The contrapositive of a conditional ‘if If p then q’ is the conditional ‘If not-q then not-p’. The two forms are equivalent. The contrapositive of a generalization ‘all All As are B’ is the equivalent ‘all All non-Bs are non-A’. This equivalence is exploited in Hempel’s paradox.


随便看

 

科学参考收录了60776条科技类词条,基本涵盖了常见科技类参考文献及英语词汇的翻译,是科学学习和研究的有利工具。

 

Copyright © 2000-2023 Sciref.net All Rights Reserved
京ICP备2021023879号 更新时间:2024/12/25 14:04:38