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[几何] 光滑曲面的投影却不光滑?

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hbghlyj Posted at 2025-2-23 22:01:26 |Read mode
content-animation.org.uk/htmls/:与计算机动画相关在1963 年至 1975 年发表的论文。

Hassler Whitney 的论文jstor.org/stable/1970070(1955)证明了对于从平面到平面的一般函数 $f$,每个奇点要么是折叠,要么是尖点,即利用合适的坐标 $(u,v)$ 和 $(x,y)$,$f$ 可以表示为 $x = u, y = v^2$ 或 $x = u, y = v^3 - uv$

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 Author| hbghlyj Posted at 2025-2-23 22:28:21
content-animation.org.uk/htmls/max_uc13.htm $$y=tz^{2}+xz-z^{4}$$ $t>0$:
X Y Z

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2025-4-20 22:23 GMT+8

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