Can you help me please with this problem?
- What do you know about $\int_{\partial \Omega}\frac{\partial u}{\partial N}d\sigma $ if $\Delta u = 0$ in $\Omega$?
- Is it always possible to solve an equation $u''=0$ in $[0,1]$ if $u'(0)$ and $u'(1)$ are given?(What is connection to first question?) Is the solution - unique?
Thanks!