射影几何学:把直线看作是具有无穷大半径的圆,而曲线的切线被看作 ..... 射影变换也可以作用于扩大空间,但经过射影变换,无穷远
回答: 年发现了曲面的两个主曲率乘积与它在外围的Euclidean空间中的形状无关,仅仅取决于其第一基本形式,这个结果被Gauss得意地
由 marketreflections
于 2011-05-05 12:07:49
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