Dr.Gunther,

As far as I know a LTI system is causal iff the ROC of a system function is the exterior part of the circle.Also a LTI system is stable iff ROC of a system function includes the unit circle.Then depending on this information, does it imply that the causal system can never be a stable system?
I request you to please explain me with the help of an example.
Thank you.

Tejas