Some of the key concepts and takeaways from Körner's book include:
: Covers the fundamentals, including Dirichlet’s results on convergence and Fejér’s theorem. fourier analysis t w korner pdf
Moving from series (periodic) to transforms (aperiodic), Körner covers the $L^1$ and $L^2$ theories. He includes a brilliant discussion of the —not from quantum mechanics, but from the Fourier relationship: a function and its transform cannot both be sharply localized. Some of the key concepts and takeaways from