kreĭn's trace formula and the spectral shift function

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ID: 245957
2001
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Abstract
Let A,B be two selfadjoint operators whose difference B−A is trace class. Kreĭn proved the existence of a certain function ξ∈L1(ℝ) such that tr[f(B)−f(A)]=∫ℝf′(x)ξ(x)dx for a large set of functions f. We give here a new proof of this result and discuss the class of admissible functions. Our proof is based on the integral representation of harmonic functions on the upper half plane and also uses the Baker-Campbell-Hausdorff formula.
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boyadzhiev2001internationalkren's Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Khristo N. Boyadzhiev
Journal structural engineering and mechanics
Year 2001
DOI
10.1155/S0161171201004318
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