# nonhomogeneous neumann boundary conditions partial perp??

• October 29th 2010, 05:07 PM
davismj
nonhomogeneous neumann boundary conditions partial perp??
http://i53.tinypic.com/2ikzcba.png

I am not sure what $\partial_\perp$ is? Is this a typo?
• October 30th 2010, 10:39 AM
Opalg
Quote:

Originally Posted by davismj
http://i53.tinypic.com/2ikzcba.png

I am not sure what $\partial_\perp$ is? Is this a typo?

Since this is a question about Neumann boundary conditions, I think you can assume that $\partial_\perp u(1,\theta)$ means the directional derivative in the direction of the normal (so the perp symbol stands for "perpendicular to the tangent")