2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/58042In the framework of scattering theory, we show how the scattering matrix can be related to the projection on the bound states by an index map of K-theory. Pairings with appropriate cyclic cocyles lead naturally to a topological version of Levinson's theorem.6 pagesMathematical Physicstext