用不变量刻画曲面
Characterizing a surface by invariants
摘要:
对无脐点的$\mathbb R^3$曲面引入正则主参数。证明了在这些参数中,曲面由一对满足等价于高斯方程的偏微分方程的不变量决定(直到空间位置)。作为这样一对不变量,我们可以使用主曲率或高斯和中曲率。
英文摘要:
Canonical principal parameters are introduced for surfaces in $\mathbb R^3$ without umbilical points. It is proved that in these parameters the surface is determined (up to position in space) by a pair of invariants satisfying a partial differential equation equivalent to the Gauss equation. As such a pair of invariants we may use the principal curvatures or the Gauss and the mean curvature.
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