Transcription of Open mapping theorem
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SOLUTIONS TO COMPLEX PRELIM PROBLEMSC IHAN BAHRANIn this document, I will collect my solutions to some (not all, probably not even half)of the Complex Prelim problems that were asked in the past in theorems get used a lot. I will copy some of them from David C. Ullrich swonderful bookComplex Made mapping theoremThis is very useful in general. It s easy to forget the connectedness assumption, so Iwill state it (V) denotes the set of analytic maps from an open mapping open andf H(V). Also letWbe an open andconnected set contained inV. Thenf(W)is either a singleton (that is,fis constantonW) or open 2011, 7 and Fall 2010, that there is no one-to-one conformal mapof the punctured disk{z C: 0<|z|<1}onto the annulus{z C: 1<|z|<2}.
that map a half plane to the unit disk. And, thanks to Ullrich’s book, I know that there is a way to do this which is really cool and impossible to forget. Let U be the upper half plane and D be the open unit disk. The neat geometric observation is that 1Why? Because the correct de nition of connectedness excludes the empty space. Otherwise we
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