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- W2070707908 abstract "Let Uo, U1 be unitary operators in a Hilbert space. If the operator Ux — Uo is nuclear, then (as M. G. Krein established) there exists a function Π on the unit circle $$mathbb{T}, eta = eta left( {mathcal{U}_1 , mathcal{U}_0 } right) eta in L^1 left( mathbb{T} right)$$ , satisfying the equality for all functions ϕ with derivative ϕ′ from the Wiener class. M. Sh. Rirman and M. G. Krein proved that the function n is connected with the scattering matrix S for the pair Uo, U1 by In this paper (1) and (2) are proved under more general (local) conditions on the pair Uo, U1. Under these conditions we investigate some properties of the function n and describe the class of functions η, which are admissible in (1). Applications to differential operators are given." @default.
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- W2070707908 date "1986-09-01" @default.
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- W2070707908 title "Local conditions for the existence of the spectral shift function" @default.
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- W2070707908 doi "https://doi.org/10.1007/bf01741582" @default.
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