Plancherel theorem

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Science and technology

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What Wikipedia says

In mathematics, the Plancherel theorem (sometimes called the Parseval–Plancherel identity) is a result in harmonic analysis, proven by Michel Plancherel in 1910. It is a generalization of Parseval's theorem; often used in the fields of science and engineering, proving the unitarity of the Fourier transform.

Excerpt from the Wikipedia article “Plancherel theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia