2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93227We introduce a model of superconductivity and discuss its relation to the quantum Hall-effect. This kind of relation is supported by the well known SQUID results. The concept of pure gauge potential as it is involved in various theoretical models concerning solid state effects in magnetic fields is also discussed.LatexQuantum Physicstext