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Aug 29, 2021 at 16:05 history made wiki Post Made Community Wiki by Stefan Kohl
Apr 26, 2010 at 15:34 comment added Nate Eldredge Bessel's inequality is also implied by Parseval's identity (given an orthonormal set, extend it to an orthonormal basis, apply Parseval, and throw away the unwanted terms).
Mar 9, 2010 at 10:40 history answered Ady CC BY-SA 2.5