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
命题
否定和置另一等价命题
项而得到命题；例
，“所有非Y是非X”是“所有X是Y”质位变命题收藏指正
句
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.
质位变命题否定和置另一等价命题项而得到命题；例，“所有非Y是非X”是“所有X是Y”质位变命题收藏指正
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