Posted by haifeng on 2015-07-21 10:45:27 last update 2015-07-21 10:45:27 | Answers (0) | 收藏
说明
\[ \{(x,y)\in\mathbb{R}^2\mid y^2=x^2(x+1)\} \]
为 $\mathbb{R}^2$ 的浸入子流形, 并画出它的图像.
