2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/125111Remarks at the Irving Kaplansky Memorial about a collaboration during the early period of the renewal of contacts between mathematicians and theoretical physicists.4 pages, based on remarks at the Irving Kaplansky Memorial at MSRI, Berkeley, Ca, February 23, 2007History and Philosophy of PhysicsHigh Energy Physics - Theorytext