My last question.Thank you very much.

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- Dec 30th 2014, 12:36 AM #1

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- Jan 4th 2015, 10:40 AM #2
## Re: docarmo 12

If the curve is, say, $\displaystyle \gamma(u), u\in [a,b]$ then a parametrization may be given by $\displaystyle X(u,v)=v\gamma(u), u\in [a,b],v\geq 0 $.

For the surface to be regular, points where the surface intersects itself do not have to be removed, as there exists a well defined tangent plane there.

What needs to be removed is the origin (where $\displaystyle v=0$) and the lines $\displaystyle v\gamma(a),v\gamma(b), v>0$.