这个反命题同样是正确的。

The contrapositive is equally true.

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建立了基于欧拉方程组的二维振荡机翼非定常气动设计反命题方法的数学模型。

A mathematical model for the inverse problem of unsteady aerodynamic design of 2-d oscillating airfoil based on Euler equations is proposed.

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主要讨论了几种极限存在的准则及其反命题的用法，方便地解决了有关极限不存在问题的论证。

This article mainly discusses some usage of criteria of limit existence and their inverse -propositions, and solves the problems of nonexistence of limit easily.

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