Question Regarding Proof of Arzela Ascoli.

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I have just proved the following:

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However my teacher provided me with the following:

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Note that $\Omega$ is open connected subset of $C$.

This is what i don't get. I know that on each compact subset of $\Omega$ there would exist a subsequence of $f_n$ that converges uniformly. But how do I know that this same subsequence converges(need not be uniformly) over $\Omega$ ?

How do I find a subsequence that converges over $\Omega$ and uniformly on compact subsets.