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211:{\displaystyle I(r)={\frac {1}{2\pi }}\int _{0}^{2\pi }\!\left|f(re^{i\theta })\right|\,d\theta }
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This article incorporates material from Hardy's theorem on
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260:and is a convex function of
249:{\displaystyle 0<r<R,}
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.