俩定理都有用，第七次作业中我会，给你们简单的问题，用到垂直轴定理。
So both are useful, and in assignment 7 I'll give you a simple problem so that you can apply the perpendicular axis theorem.
利用采用了所谓的广义采样定理的特殊情况的滤波器来校正垂直位置误差。
Vertical positional errors are corrected using a filter employing a special case of the so-called Generalised Sampling Theorem.
文章给出了模糊内积空间中垂直的定义，介绍了正规正交基，然后利用它讨论了模糊内积空间的一些性质，并证明了勾股定理。
In this paper, the vertical concept on the fuzzy inner product space is given and a regular vertical base is introduced.
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