Lower bound $\langle (I + A)^{-1}x, x \rangle$ given that $\sigma_\text{max}(A) < 1$
Posted by PAb, at mathoverflow.net,
Let $A$ a square real matrix such that the largest singular value $\sigma_\text{max}(A) = \sigma < 1$. I want to find a lower…
Positivstellensätze for noncommutative rational expressions
Overview of attention for article published in Proceedings of the American Mathematical Society, September 2017