contrapositive rule[计] 倒置规则;翻译;对调规则
contrapositive form[自] 换位形式
contrapositive law假言易位
contrapositive sentence换质位
The contrapositive逆反命题
contrapositive symmetry逆否对称性
contrapositive contraposition proposition逆否命题
contrapositive cam engine对置式凸轮发动机
proof f by contrapositive反证法
ADJ（形容词） placed opposite or against 对照的
N（名词） a conditional statement derived from another by negating and interchanging antecedent and consequent 对换句
N（名词） a categorial proposition obtained from another, esp validly, by any of a number of operations including negation, transferring the terms, changing their quality, and also possibly weakening from universal to particular 对换命题