2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/144560For scattering systems consisting of a (family of) maximal dissipative extension(s) and a selfadjoint extension of a symmetric operator with finite deficiency indices, the spectral shift function is expressed in terms of an abstract Titchmarsh-Weyl function and a variant of the Birman-Krein formula is proved.38 pagesMathematical Physics47A40, 47A55, 47B44text