逆命题的英文：
contrary proposition
inverse proposition
converse

contrary是什么意思：
adj.对立的 ；相反的
n. 相反；反面
adv. 相反地

the direct opposite [contrary]
正好相反的东西

He produced no evidence to the contrary.
他没有拿出相反的证据。

My view is clean contrary.
我的看法完全相反。

proposition是什么意思：
n. 建议，提议，任务，法律修正议案，观点，命题
v. 提议；建议，向···求欢

To state or assume as a proposition in an argument.
假设，预设命题在论证中做为一命题陈述或假设。

A subsidiary proposition assumed to be valid and used to demonstrate a principal proposition.
引理，辅助定理被认为是合理且被用于证明主要命题的次要命题

The proposition is so clear that it needs no explanation.
观点十分明确，无须解释.

inverse是什么意思：
n. 相反；倒转
adj. 相反的；逆向的；倒转的

The value of a fraction is inversely proportional to that of the denominator
分数值与分母值成反比例。

The recorder trace is a series of inverse peaks.
记录器扫迹是一系列相反的波峰。

The value of a fraction is inversely proportional to that of the denominator.
分数值与分母值成反比例。