The corresponding variation equation has also been derived to solve this problem.
为了获得该椭圆边值问题的解，推导出了有限元求解变分方程。
The variation of twist with time is represented by a false-twist equation.
在假捻过程中捻度随时间变化的规律一般用假捻方程表示。
Ray equation is derived from Fermat's principle in variation form.
本文由费马原理的变分形式，导出光线微分方程。
Ray equation is derived from Fermat's principle in variation form.
本文由费马原理的变分形式，导出光线微分方程。
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