2004/10/26 | 曲线亏数[Curve Genus]
类别(∑〖数学〗) | 评论(0) | 阅读(23) | 发表于 13:28
One of the Plücker characteristics, defined by

where m is the class, n the order,the number of nodes, the number of cusps, the number of stationary tangents (inflection points), and the number of bitangents.
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