I let {${u_n}$}is a sequence of harmonic functions defined on an open disk and $|u_n|≤M$,where {$u_n$}satisfying $u_n(x)$→$u(x)$ for a.e.$x$ as n tends to infinity.
And then I can't think of any way in complex analysis that I can keep doing this problem, so I'm going to use the formula I learned in real analysis, right
$$\int u(x)dx＝lim_{n→∞}\int u_n( x)dx$$
But then I don't know how to use the harmonic function and the compact set and who can give me a little help, thank you very much