尖点 Cusp (singularity)
（重定向自Spinode）
尖点（cusp）是曲线中的一种奇点，曲线在尖点时，没有自相交的情形。
所有平面曲线的尖点都是以下曲线的微分同胚：
x − y = 0，其中k ≥ 1为一整数。
若一曲线可以由几组光滑函数来表示，几组光滑函数有交点，但曲线只通过此交点一次，此交点即为尖点。
spinode
/'spaɪnod/
英汉-汉英词典
n. [数]歧点，尖点
词组 | 习惯用语
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- spine n. 脊柱，脊椎；刺；书脊
- spindle n. 轴；纺锤，锭子；细长的人或物 adj. 细长的；锭子的，锭子似的
- spandex n. [纺]斯潘德克斯弹性纤维（用于腰带、游泳衣等）
- spindly adj. 细长的；纺锤形的
spinode n. 歧点，尖点
中文百科
英语百科
Cusp (singularity) 尖点
（重定向自Spinode）
In mathematics a cusp, sometimes called spinode in old texts, is a point on a curve where a moving point on the curve must start to move backward. A typical example is given in the figure. A cusp is thus a type of singular point of a curve.
For a plane curve defined by a differentiable parametric equation
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