导出了在SU_6分类下，计算能量矩阵元的公式。
The formula for the energy matrix element under SU_6 is also derived.
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.
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 corresponding variation equation has also been derived to solve this problem.
全文的研究共分三大部分：理论导出、实证研究、结论与启示。
The whole paper is divided into three sections: theoretical discussion, empirical research and study conclusion.
全文的研究共分三大部分：理论导出、实证研究、结论与启示。
The whole paper is divided into three sections: theoretical discussion, empirical research and study conclusion.
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