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Morera's theorem
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===Uniform limits=== For example, suppose that ''f''<sub>1</sub>, ''f''<sub>2</sub>, ... is a sequence of holomorphic functions, [[uniform convergence|converging uniformly]] to a continuous function ''f'' on an open disc. By [[Cauchy's integral theorem|Cauchy's theorem]], we know that <math display="block">\oint_C f_n(z)\,dz = 0</math> for every ''n'', along any closed curve ''C'' in the disc. Then the uniform convergence implies that <math display="block">\oint_C f(z)\,dz = \oint_C \lim_{n\to \infty} f_n(z)\,dz =\lim_{n\to \infty} \oint_C f_n(z)\,dz = 0 </math> for every closed curve ''C'', and therefore by Morera's theorem ''f'' must be holomorphic. This fact can be used to show that, for any [[open set]] {{math|Ξ© β '''C'''}}, the set {{math|''A''(Ξ©)}} of all [[bounded function|bounded]], analytic functions {{math|''u'' : Ξ© β '''C'''}} is a [[Banach space]] with respect to the [[supremum norm]].
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