Fourier Transform
mathematics
Fourier transform, in mathematics, a particular integral transform. As a transform of an integrable complex-valued function f of one real variable, it is the complex-valued function f ˆ of a real variable defined by the following equation
In the integral equation 
the function f (y) is an integral transform of F(x), and K(x,y) is the kernel. Often the reciprocal relationship is valid: 
See integral transform.
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