2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51099A connection between integrable quantum field theory and the spectral theory of ordinary differential equations is reviewed, with particular emphasis being given to its relevance to certain problems in PT-symmetric quantum mechanics.12 pages, 9 figures. Contribution to the proceedings of the NATO Advanced Research Workshop on Statistical Field Theories, Como, 18-23 June 2001High Energy Physics - TheoryCondensed MatterMathematical PhysicsSpectral TheoryQuantum Physicstext