2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/69072This is a celebratory and pedagogical discussion of Sturm oscillation theory. Included is the discussion of the difference equation case via determinants and a renormalized oscillation theorem of Gesztesy, Teschl, and the author.Spectral TheoryMathematical Physicstext