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
得到命题；例
，“所有非Y
非X”“所有XY”质位变换命题收藏指正
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得到命题；例，“所有非Y非X”“所有XY”质位变换命题收藏指正
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