幾何学：円に逆関数

最近メービウス変換を分かるために複素解析とそれに関わる幾何学を学んでいます。
The inversion of a point in the unit circle of a point inside that circle is a point outside the circle, and vice versa. The inversion of a circle passing through the center of the circle with respect to which it is being inverted is a line.