Pinch point (mathematics)

（重定向自Cuspidal point）

In geometry, a pinch point or cuspidal point is a type of singular point on an algebraic surface.

The equation for the surface near a pinch point may be put in the form

where [4] denotes terms of degree 4 or more and $v$ is not a square in the ring of functions.

单词	Cuspidal point
释义	Cuspidal point 英语百科 Pinch point (mathematics) （重定向自Cuspidal point） In geometry, a pinch point or cuspidal point is a type of singular point on an algebraic surface. The equation for the surface near a pinch point may be put in the form where [4] denotes terms of degree 4 or more and $v$ is not a square in the ring of functions.
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