球面的特征探讨

An Important Characteristic of A Sphere

探讨了球面的又一个重要特征:曲面是球面的充要条件为到两定点的距离之比不等于1的正常数的点的轨迹。

This artile has proved that a surface in three dimensional space is a sphere if and only if the surface is the locus of moving point such that the distances from two fixed points have a positive coustant ratio(≠1).