Dandelin 双球 问题中的Dandelin是人名么?是谁?谁有他的数学史?

总有一条路2022-10-04 11:39:541条回答

Dandelin 双球 问题中的Dandelin是人名么?是谁?谁有他的数学史?
在人教版教材的选修本4-1几何证明选讲的第三讲“圆锥曲线的探讨”中介绍了“Dandlin双球”,就是Dandelin在圆柱里上下各塞进内切球,球面与切截平面的切点就是焦点,得到椭圆.

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Germinal Pierre Dandelin (April 12, 1794 - February 15, 1847) was a mathematician, soldier, and professor of engineering. He was born near Paris to a French father and Belgian mother, studying first at Ghent then returning to Paris to study at the École Polytechnique. He was wounded fighting under Napoleon. He worked for the Ministry of the Interior under Lazare Carnot. Later he became a citizen of the Netherlands, a professor of mining engineering in Belgium, and then a member of the Belgian army.
He is the eponym of the Dandelin spheres, of Dandelin's theorem in geometry (for an account of that theorem, see Dandelin spheres), and of the Dandelin-Gräffe numerical method of solution of algebraic equations. He also published on the stereographic projection, algebra, and probability theory.
1年前

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这些是圆锥曲线,就是用一个平面去截一个圆锥,当角度和截距不同时就会截得这三种曲线.
其实高中的解析几何是大学空间解析几何的基础和简化,等你学了空间解析几何就能有更深层次的认识了.比如什么椭圆抛物面,双曲抛物面等等,你可以想象一下.