Theorem on Inverse Fourier Transform
Theorem on Inverse Fourier Transform:
Theorem. Let f ∈ L1 (R) and let f be piecewise smooth on R. Then for every x ∈R,
If x is a point of continuity of f, then
For all Φ ∈ L1 (R), we call The inverse Fourier transform of Φ = f^, then we define;
at a point of discontinuity of f.
Then That is F-1Ff = f.
The inverse Fourier transform is useful in computing Fourier transforms. Since It follows that
Interchanging the role of x and ξ multiplying by 2π leads to In a similar functions every Fourier Series transform pair defines a dual pair using the Inverse Fourier Transform.