Abstract
We present an inequality and an identity involving Gram determinants, which can be viewed as a generalization of Bessel"s and Parseval"s, respectively.
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Gunawan, H. A generalization of Bessel"s inequality and Parseval"s identity. Periodica Mathematica Hungarica 44, 177–181 (2002). https://doi.org/10.1023/A:1019640429393
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DOI: https://doi.org/10.1023/A:1019640429393