I'm trying to prove with Heisenberg inequality that a function f and its Fourier transform cannot both be compactly supported. I've only found on google that it's a well-known fact but i need to understand the proof...
I'm trying to prove with Heisenberg inequality that a function f and its Fourier transform cannot both be compactly supported. I've only found on google that it's a well-known fact but i need to understand the proof...