# Thread:

1. ## regular surface

Show that the cylinder { $(x,y,z)$ in $R^3; x^2+y^2=1$} is a regular surface, and find parametrizations whose coordinate neighborhoods cover it.

Please help.

2. I won't do it for you but..

Parameterize it using cylindrical coordinates into some parameterization S.

To show it is regular you can
-Show the first partial derivative of S are independant.
or
-Show that the cross product of the first partial derivatives of S is non zero

there are many other ways to show it is regular.

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