Ciro Santilli
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Fourier basis is complete for | 🗖 nosplit | ↑ parent "Riesz-Fischer theorem" | 55, 2, 230

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Riesz-Fischer theorem is a norm version of it, and Carleson's theorem is stronger pointwise almost everywhere version.
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Note that the Riesz-Fischer theorem is weaker because the pointwise limit could not exist just according to it: norm sequence convergence does not imply pointwise convergence.
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