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math.FA2004
Approximation by analytic operator functions. Factorizations and very badly approximable functions
V. V. Peller, S. R. Treil
This is a continuation of our earlier paper \cite{PT3}. We consider here operator-valued functions (or infinite matrix functions) on the unit circle $\T$ and study the problem of a…
math.FA2004★ 2 cited
An extension of the Koplienko-Neidhardt trace formulae
Vladimir Peller
Koplienko [Ko] found a trace formula for perturbations of self-adjoint operators by operators of Hilbert Schmidt class $\bS_2$. A similar formula in the case of unitary operators w…