z-Transform Note: The unit step sequence u[n] is not absolutely summable, and hence its dtFt does not converge uniformly Example- Consider the anti-causal sequence yn]=-0"-n-1] 12 Copyright C 2001, S K MitraCopyright © 2001, S. K. Mitra 12 z-Transform • Note: The unit step sequence [n] is not absolutely summable, and hence its DTFT does not converge uniformly • Example - Consider the anti-causal sequence y[n] = − [−n −1] n