Gesztesy, F.; Pushnitski, A.; Simon, B.
(Журнал математической физики, анализа, геометрии, 2008)
We study the Koplienko Spectral Shift Function (KoSSF), which is distinct from the one of Krein (KrSSF). KoSSF is defined for pairs A,B with (A - B) is in I₂, the Hilbert{Schmidt operators, while KrSSF is defined for pairs ...