2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/125498A general integral formula for the spectral flow of a path of unbounded selfadjoint Fredholm operators subject to certain summability conditions is derived from the interpretation of the spectral flow as a winding number.10 pagesFunctional AnalysisSpectral Theory58J30; 47B10Spectral flow as winding number and integral formulastext