平面几何的定理、公式、法则反映了几何概念的内在联系，揭示了它们之间的基本规律。
The theorems, formulas and principles in plane geometry reveal the intrinsic relations and basic laws of geometrical concepts.
接着，仿微分几何的曲线论，建立了基本公式和唯一存在定理。
Then the basic formulae and the theorem on its unique existence have been established as doing in the curve theory in Differential Geometry.
几何光学中高斯公式的推导可以不依赖象反射和折射这些特定的基本原理。
The Gauss's formula in Geometrical optics derived without relying on specific mechanisms such as reflection and refraction.
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