FLASH]
两个外来人的故事
mathjpkc.gdcc.edu.cn/.../20071120105604.swf
檔案類型: Shockwave Flash他选取球的表面作为平面,像庞加莱一样,他把点考虑为位置,按照笛卡尔的方式作为数偶或坐标(实质上是点的经度、纬度)。黎曼的直线是球面的测地线—大圆。
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