Then series expansions of multi-variable functions are applied to the derived approximations in terms of phase angles to generate the approximations in terms of group angles.

然后连续利用多元函数级数展开，导出群角表示的相速度和群速度近似公式。

youdao

Then series expansions of multi-variable functions are applied to the derived approximations in terms of phase angles to generate the approximations in terms of group angles.

然后连续利用多元函数级数展开，导出群角表示的相速度和群速度近似公式。

youdao