Functions of perturbed noncommuting unbounded self-adjoint operators

Aleksei Aleksandrov, Vladimir Peller

Let $f$ be a function on ${\mathbb{R}}^2$ in the inhomogeneous Besov space $B_{\infty ,1}^1({\mathbb{R}}^2)$. For a pair $(A,B)$ of not necessarily bounded and not necessarily commuting sel…