MHB Mean square convergence of Fourier series

Dustinsfl
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What is the statement of the mean square convergence of Fourier series?
 
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dwsmith said:
What is the statement of the mean square convergence of Fourier series?

You can find the definition of mean square convergence >>here<<.
 
I posted this question on math-stackexchange but apparently I asked something stupid and I was downvoted. I still don't have an answer to my question so I hope someone in here can help me or at least explain me why I am asking something stupid. I started studying Complex Analysis and came upon the following theorem which is a direct consequence of the Cauchy-Goursat theorem: Let ##f:D\to\mathbb{C}## be an anlytic function over a simply connected region ##D##. If ##a## and ##z## are part of...

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