曲面的奇点

a point of honour make a point of a point of view evolute of a surface a point of no return content of a point set a point of safe return make a point of doing parametric representation of a surface genus of a closed surface prolongation of a Riemann surface directed element of a surface singular point of a function singular generator of a ruled surface parabolic point of a surface planar point of a surface singular values of a matrix singular surface singular point circular point on a surface hyperbolic point on a surface application of a surface binode of a surface