nonhomogeneous neumann boundary conditions partial perp??

http://i53.tinypic.com/2ikzcba.png

I am not sure what is? Is this a typo?

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Originally Posted by davismj

http://i53.tinypic.com/2ikzcba.png

I am not sure what is? Is this a typo?

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