Riesz–Fischer theorem
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Parseval's identity
List of mathematical identities
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Wirtinger's inequality for functions
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Bessel's inequality
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Marc-Antoine Parseval
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Parseval's theorem
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List of harmonic analysis topics
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Square (algebra)
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Spectral theory
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Basel problem
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List of functional analysis topics
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Orthonormal basis
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Integral
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Inner product space
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