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Help me please with this question.

Let's $\Delta u>0$ in connected domain in $\mathbb{R}^{n}$. Is it possible that function $u$ have local minimum? Can you show an example?

Thanks!!

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    You've asked seven questions, all of which are stated as "Help me please with this question - some question - thanks". No motivation, no context, no thinking beforehand. If you've done some work, show it; otherwise, it's time for you to do some effort.2012-07-09

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$f(x,y)=x^2 + y^2$ on all of $\mathbb{R}^2$

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    @Mushka Yes, that will do, too. T2012-07-10