Parseval's theorem
plural of billhook
(mathematics) The result that the Fourier transform is unitary; loosely, that the sum (or integral) of the square of a function is equal to the sum (or integral) of the square of its transform.
plural of head of state
Of or pertaining to a perihelion.
講義で教授はフーリエ変換がユニタリであるという定理を用いて、信号のエネルギーが保存されることを示した。
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