Supplementary mathematics/Integral of Fourier

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In differential and integral calculus, mathematical analysis and mathematical expansions, the Fourier integral or the Fourier integral operator has become an important element in the theory of numerical differential and integral equations. The class and function of the Fourier integral is applied in mathematics and as a branch of mathematics. The class of Fourier integral operators is as a differential operator, as well as classical integral operators as special cases.