> [with regards to y = A x:] This should look familiar, because it is a neural network layer with no activation function and no bias. This line makes me think

> [with regards to y = A x:] This should look familiar, because it is a neural network layer with no activation function and no bias. This line makes me think this might be satire. Are there really people who see y = A x and think neural networks? Otherwise, a better title would be "The Fourier transform is a linear operation. (neural networks can do linear operations too)" ... which makes it pretty boring.