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
题由否定和
一等价题的项而得到的题；例
，“所有的非Y是非X”是“所有的X是Y”的质位题收藏指正
句的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.
质位题由否定和一等价题的项而得到的题；例，“所有的非Y是非X”是“所有的X是Y”的质位题收藏指正
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