>The fast Fourier transform viewed as a sparse matrix factorization of the DFT Riffing further on the Fourier connection: are you planning to explore the link

>The fast Fourier transform viewed as a sparse matrix factorization of the DFT Riffing further on the Fourier connection: are you planning to explore the link between matmul and differentiation? Using the "Pauli-Z" matrix that you introduced without a straightforward motivation, eg. (I took it that you intended it to be a "backyard instance" of "dual numbers")