I have read in some dsp texts that when ROC includes unit circle,system is stable
But i am bit confused in difference between stability and marginal stability depending Upon ROC
Especially i am confused by part c of below dsp.se question
Where in part C, ROC is 1/3 < |z| < 1 and analysis answer of part c is written as "non-causal & marginally stable" . I am confused by marginal stability. why it is marginally stable?If our ROC is changed to 1/3 < |z| < 1.1, will now it becomes stable or will it still remains marginally stable?