Respuesta :

LammettHash

Use cylindrical coordinates.

[tex]\vec s(x,y,z) = \vec\sigma(r,\theta,z) = r\cos(\theta)\,\vec\imath + r\sin(\theta)\,\vec\jmath + r^2\cos(\theta)\sin(\theta)\,\vec k[/tex]

where [tex]0\le r\le3[/tex] and [tex]0\le\theta\le2\pi[/tex].