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2. The inverse FT operation may be performed using the same FFT routine by taking the forward FT of the conjugate of the given function, and then taking the conjugate of the result.
3. The DFT and its inverse are periodic signals:
F(u,v)=F(u+N,v)=F(u,v+N)=F(u+N,v+N).
4. The FT is conjugate symmetric for real signals:
F(-u,-v)=F*(u,v). Hence, |F(-u,-v)| = | F(u,v)|