2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/135906We prove a variant of Sch'nol's theorem in a general setting: for generators of strongly local Dirichlet forms perturbed by measures. As an application, we discuss quantum graphs with $δ$- or Kirchhoff boundary conditions.18 pagesSpectral TheoryAnalysis of PDEstext