## The spectral shift function arising from perturbations of a positive operator.(Russian)Zbl 0505.47016

### MSC:

 47B25 Linear symmetric and selfadjoint operators (unbounded) 47A55 Perturbation theory of linear operators 47B10 Linear operators belonging to operator ideals (nuclear, $$p$$-summing, in the Schatten-von Neumann classes, etc.) 47B06 Riesz operators; eigenvalue distributions; approximation numbers, $$s$$-numbers, Kolmogorov numbers, entropy numbers, etc. of operators

### Citations:

Zbl 0191.152; Zbl 0139.056