2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/84930Lochlainn O'Raifeartaigh and his work are recalled; the connection between fluid mechanics -- his last research topic -- and noncommuting gauge fields is explained.9 pp., 1 photo, using LaTeX and BoxedEPSF macros; email to jackiw@lns.mit.edu; O'Raifeartaigh Memorial Meeting, Dublin, Ireland, September 2002History and Philosophy of PhysicsHigh Energy Physics - TheoryMathematical PhysicsFluid Dynamicstext