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mathematical technique > mathematical physics > Plancherel theorem

mathematical technique > mathematical analysis > functional analysis > harmonic analysis > Plancherel theorem

Plancherel theorem

In mathematics, the Plancherel theorem (sometimes called the Parseval–Plancherel identity) is a result in harmonic analysis, proven by Michel Plancherel in 1910. It states that the integral of a function's squared modulus is equal to the integral of the squared modulus of its frequency spectrum. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Plancherel_theorem)

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