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
题由否定和置换另一等价题
项而得
题；例
，“所有
Y
X”“所有XY”质位变换题收藏指正
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.
质位变换题由否定和置换另一等价题项而得题；例，“所有YX”“所有XY”质位变换题收藏指正
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