摘要
对于直言命题的变形推理,传统上认为O命题不能换位。本文通过欧拉图我们可以证明以全称命题为前提的换质位法推理中O命题是能够换位的。它完全符合传统的直言命题变形推理规则。
Regarding deformed reasoning in categorical proposition, people think that the O-proposition can not been converted on tradition. In fact, it is possible to exert conversion on O-proposition in conversion by contraposition inference which takes the premise by the universal proposition. It conforms to the tradition to deformed reasoning rule in categorical proposition.
出处
《安徽农学通报》
2008年第20期144-145,共2页
Anhui Agricultural Science Bulletin
关键词
全称命题
0命题
换位法
换质位法
universal proposition
O-proposition
conversion
contraposition
