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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A 3-d ray equation on optical trajectory of laser propagation in the laser-driven fusion is firstly proposed.

提出了激光聚变中激光传播的三维光学轨迹光路方程。

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Based on paraxial meridian-ray equation, the principle of fibre accelerometer using self-focussing lens is studied;

本文根据近轴子午光线方程，研究了自聚焦透镜光纤加速度计的工作原理；

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Ray Fair, an economist at Yale, famously devised an equation linking the outcome of presidential elections to inflation and output growth, but mid-terms are murkier.

ECONOMIST: The mid-term elections