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
由否定和置换另一等价命
而得到命；例
，“所有非Y是非X”是“所有X是Y”质位变换命收藏指正
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.
质位变换命由否定和置换另一等价命而得到命；例，“所有非Y是非X”是“所有X是Y”质位变换命收藏指正
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