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[求助] 求助一道复变函数题

Let C be a circle in C, and let C be it stereographic image on∑. If C is a great circle, then Lc stereographically induces reflection of ∑ in C,but what transformation is induced if C is an arbitrary circle? Generalize the argument of figure [14] to show that Lc becomes projection from the vertex v of the cone that touches ∑ along C. That is, if w = Lc(z) then w is the second intersection point of ∑ with the line in space that passes through the vertex v and the point z. 让C是复平面的一个圆,C是它对∑球面影像。如果C是一大圆,然后Lc诱导球面∑的反射如果C是一个任意的圆呢? Lc变得切球∑与C的圆锥顶点v的投影.也就是,如果w=Lc(z)然后w是在空间通过顶点v和点z的∑的第二个交点。
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