z-Transform From our earlier discussion on the uniform convergence of the DTFT, it follows that the series G(re0)=∑g noyon nre 1=-00 converges ifigin]r"is absolutely summable, 1.e < =-0 Copyright C 2001, S K. MitraCopyright © 2001, S. K. Mitra 6 z-Transform • From our earlier discussion on the uniform convergence of the DTFT, it follows that the series converges if is absolutely summable, i.e., if =   =−  − −  n j n j n G(r e ) g[n]r e { [ ] } n g n r −     =− − n n g[n]r