> This is the operation called discrete convolution, and it’s the equivalent of multiplying two polynomials in coefficient form. As a physicist my first though

> This is the operation called discrete convolution, and it’s the equivalent of multiplying two polynomials in coefficient form. As a physicist my first thought would be that convolution is simply multiplying in Fourier-space anyway, no need to think about polynomials. I didn't know the application of FFT for polynomials though so thanks for that.