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References to 'Parseval equality'
1. all orthonormal bases have the same cardinality by asteroid
2. Bessel inequality by ariels
3. classification of Hilbert spaces by asteroid
4. direct integral of Hilbert spaces by rspuzio
5. frame by swiftset
6. proof of classification of separable Hilbert spaces by rspuzio
7. proof of sampling theorem by stevecheng
8. uncertainty theorem by dh2718
9. value of Riemann zeta function at $s = 4$ by pahio
10. value of the Riemann zeta function at $s=2$ by alozano
11. Wirtinger's inequality by rspuzio