Fourier Transform, Optical Computing, Technology, Next Generation Tech.
(the only root is 1 itself), n = 2 (the two roots are 1 and -1) and n = 4 (the four roots are 1, -1, i, and -i). ³ If that is not the case but b₂ > 1, one can first write x as a sum of several vectors with at most k coefficients each, where k is a positive integer such that b₂ > 1 + ⌈log N⌉, go