2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/79466The new representation formula for the spectral shift function due to F.Gesztesy and K.A.Makarov is considered. This formula is extended to the case of relatively trace class perturbations.LaTeX 2e, 38 pagesSpectral TheoryFunctional Analysis47A55; 47B25text