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ch 17.5 二次曲面处表述优化建议 #186

@dreamofcoffee

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@dreamofcoffee

“在三维空间中一点 $P (p_1, p_2, p_y),F(x_1, x_2, y)$ 曲面法向量 $\bf{n}_p$通过下式得到” 是否换成“在三维空间中曲面 $F(x_1, x_2, y)$ 上一点 $P (p_1, p_2, p_y)$处的法向量 $\boldsymbol{n}_p$ 通过下式得到”更加通顺明确一点?

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