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con·tra·pos·i·tive AHD[kŏn'trə-pŏzʹĭ-tĭv] D.J.[ˌkɒntrəˈpɒzɪtɪv]K.K.[ˌkɑntrəˈpɑzɪtɪv]n.Logic（名词）【逻辑学】- A proposition derived by negating and permuting the terms of another, equivalent proposition; for example,All not-Y is not-X is the contrapositive of All X is Y. 质位变换命题：由否定和置换另一等价命题的项而得到的命题；例如，“所有的非Y是非X" 是 “所有的X是Y" 的质位变换命题
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