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| Let C be a circle in C, and let C be it stereographic image on¡Æ. If C is a great circle, then Lc stereographically induces reflection of ¡Æ 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 ¡Æ along C. That is, if w = Lc(z) then w is the second intersection point of ¡Æ with the line in space that passes through the vertex v and the point z. ÈÃCÊǸ´Æ½ÃæµÄÒ»¸öÔ²,CÊÇËü¶Ô¡ÆÇòÃæÓ°Ïñ¡£Èç¹ûCÊÇÒ»´óÔ²,È»ºóLcÓÕµ¼ÇòÃæ¡ÆµÄ·´ÉäÈç¹ûCÊÇÒ»¸öÈÎÒâµÄÔ²ÄØ? Lc±äµÃÇÐÇò¡ÆÓëCµÄÔ²×¶¶¥µãvµÄͶӰ.Ò²¾ÍÊÇ,Èç¹ûw=Lc(z)È»ºówÊÇÔÚ¿Õ¼äͨ¹ý¶¥µãvºÍµãzµÄ¡ÆµÄµÚ¶þ¸ö½»µã¡£ |
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