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Riemann mapping theorem

Let $\Omega \subseteq \mathbb{C}$ be a region and $\mathbb{D}$ be the unit disk, $\mathbb{D}=\{z\in\mathbb{C}:|z|<1\}$. We define the equivalence relation of the set of the regions in $\mathbb{C}$ as follows: Two regions $\Omega_1,\Omega_2 \subseteq \mathbb{C}$ are conformally equivalent ($\Omega_1 \sim \Omega_2$) when there is $f\in H(\Omega_1)$ ($f$ analytic on $\Omega_1$) with $f:\Omega_1 \rightarrow \Omega_2$ is bijective (one to one).

Then we have: $\Omega \sim \mathbb{D} \Leftrightarrow \Omega$ is simply connected and $\Omega \neq \mathbb{C}$.

My questions revolves around the proof. Can someone describe me in descriptive steps (an outline in words) how the proof works?

Thank you very much for your time and patience, I appreciate it very much!

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    @Chris No, you first said it was the set of all open disks, and then a few characters later, it is the *unit disk* (which is probably what you intend, otherwise the $\Omega \sim \mathbb{D}$ doesn't make much sense).2012-06-08

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I've found following resource:

http://www.dancalloway.com/lets_have_a_word/riemann-mapping-theorem-explained

It's really very good and fitted my needs well.

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    the link has died :(2016-01-26