Answers are grounded in this paper and cite their sources.
A simple sufficient Condition for a nonlinear time-varying feedback system, which is Open-loop unstable, to be closed-loop unstable is presented. Various other theorems using the same basic idea are proved.
No takes yet. Share an insight, caveat, or question.
M. Vidyasagar (1972) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: