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<<.
 
A sphere as topological manifold can be defined by gluing together the boundary of two disk. Basically one starts assigning each disk the subspace topology from ##\mathbb R^2## and then taking the quotient topology obtained by gluing their boundaries. Starting from the above definition of 2-sphere as topological manifold, shows that it is homeomorphic to the "embedded" sphere understood as subset of ##\mathbb R^3## in the subspace topology.

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