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CONSTRUCTING A FAMILY OF CONICS BY CURVATURE-DEPENDENT OFFSETTING FROM A GIVEN CONIC

机译:通过给定圆锥曲线上与曲率有关的偏移量构造圆锥曲线家族

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摘要

Three new general properties of conic sections are established, namely:(1) By offsetting from a given conic (ellipse, parabola or hyperbola) perpendicularly to it by a distance proportional to the cube root of its radius of curvature, another conic of the same kind is generate;(2)The cube root (or proportional to it) is the only function for with such a property can be stated;(3) The cube root of the radius of curvature at any point is proportional to its distance to any one of the principal axes of the conic, taken perpendicularly to it. Starting from any particular conic ,and taking the proportionality constant k as a parameter ,a family of conics of its kind is generated. Piling these conics up in the 3D space, different surfaces can be defined .If one of the Cartesian coordinates is made to be proportional to k, these surfaces are ruled, which greatly facilitates their constructive applications. We derive the parametric equations of these surfaces and represent them graphically, choosing viewpoints for a good visulization. Some ideas of applications are proposed for further development.
机译:建立了圆锥形截面的三个新的一般特性,即:(1)通过与给定圆锥形(椭圆形,抛物线或双曲线)垂直地偏移一个与其圆锥形曲率半径的立方根成正比的距离,产生;(2)立方根(或与其成正比)是具有这种性质的唯一函数;(3)任意点的曲率半径的立方根与其到任意点的距离成正比圆锥的主轴线之一,垂直于圆锥线。从任何特定的圆锥曲线开始,并以比例常数k作为参数,生成了此类圆锥曲线家族。将这些圆锥体堆积在3D空间中,可以定义不同的曲面。如果将笛卡尔坐标之一与k成比例,则可以对这些曲面进行裁切,这极大地促进了其构造性应用。我们导出这些曲面的参数方程式,并以图形方式表示它们,选择视点以获得良好的可视化效果。提出了一些应用的想法,以供进一步开发。

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