A Taylor-like expansion of a commutator with a function of self-adjoint, pairwise commuting operators

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Abstract

Let $A$ be a $\nu$-vector of self-adjoint, pairwise commuting operators and $B$ a bounded operator of class $C^{n_0}(A)$. We prove a Taylor-like expansion of the commutator $[B,f(A)]$ for a large class of functions $f:\mathbb{R}^\nu\to\mathbb{R}$, generalising the one-dimensional result where $A$ is just a self-adjoint operator. This is done using almost analytic extensions and the higher-dimensional Helffer-Sjöstrand formula.
Original languageEnglish
Place of PublicationÅrhus
PublisherAarhus University, Department of Mathematical Sciences
Number of pages12
Publication statusPublished - 2010
Externally publishedYes

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