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Let be $u\in W^{m,p}(\mathbb{R^n})$. Show that if a one partial derivate of $u$ is zero, then $u = 0$.

How I can be able to start this proof?

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    Can you define your notation?2012-10-26
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    $W^{m,p}$ is usually the space of functions in $L^p$ with weak partial derivatives of order $\le m$ in $L^p$.2012-10-26

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