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Consider $\Delta u =f(x) , x \in \Omega $ and $\nabla u\cdot n +\alpha u = g(x) , x\in \partial\Omega $, where $n$ is outward normal. Can anyone give me a hind how to find sufficient condition on $\alpha$ so that the solution is unique. Thanks

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    what do you mean by $\nabla\cdot n$? Do you mean $\nabla u\cdot n$ instead?2012-07-03
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    @Paul : thanks for pointing out.2012-07-03
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    For future reference, you should write the operators as `\Delta` and `\nabla` instead of `\triangle` and `\triangledown`.2012-07-03
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    @RahulNarain : thank you , i didn't know that .2012-07-03

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