Open Mapping Theorem (Complex Analysis)
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Open Mapping Theorem (Complex Analysis)

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In complex analysis, the open mapping theorem states that if U is a connected open subset of the complex plane C and f : U C is a non-constant holomorphic function, then f is an open map (i.e. it sends open subsets of U to open subsets of C). The open mapping theorem points to the sharp difference between holomorphy and real-differentiability. On the real line, for example, the differentiable function f(x) = x2 is not an open map, as the image of the open interval ( 1...