2004/10/30 | 二重点[Double Point]
类别(∑〖数学〗) | 评论(0) | 阅读(53) | 发表于 13:11
A point traced out twice as a closed curve is traversed. The maximum number of double points for a nondegenerate quartic curve is three. An ordinary double point is also sometimes known as a node.

Arnold (1994) gives pictures of spherical and plane curves with up to five double points, as well as other curves.
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