Thanks!
On Fri, Mar 16, 2018, 10:27 PM Andrey Novoseltsev
wrote:
> On Fri, Mar 16, 2018 at 4:18 PM, Jorge Garcia wrote:
> > Dear Hive Mind:
> >
> > Why is there no Divide By Zero Error here:
> >
> http://sagecell.sagemath.org/?z=eJwljkELgkAUhO-C_2GiAtek1kuX2Eu4pBc3NjEqCqQ2E-QlpvX3cwuGd5jHzDdjZH
On Fri, Mar 16, 2018 at 4:18 PM, Jorge Garcia wrote:
> Dear Hive Mind:
>
> Why is there no Divide By Zero Error here:
> http://sagecell.sagemath.org/?z=eJwljkELgkAUhO-C_2GiAtek1kuX2Eu4pBc3NjEqCqQ2E-QlpvX3cwuGd5jHzDdjZHGyw6BUZdgoFQXYx1JLa2WxRJTkSSSxPuAotYLUWumR64zRcDEJOecBtFhOA3QitHZpyLRFZ1BR03fDvd
This makes sense. It most probably has a pre-set minimal interval length, so it
stops splitting at certain moment.
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The function ParametrizedSurface3d is particularly useful for teaching on
differentiable surfaces, but if I am not wrong there is a problem with the
computation of principal directions. They are the eigenspaces for the shape
operator. The issue is that the shape operator is presented as a matrix
