2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/67473This is the text of the Hermann Weyl Prize lecture given by the author at the XXIV Colloquium on Group Theoretical Methods in Physics, Paris, July 2002 (to appear in the Proceedings of the Colloquium).12 pagesQuantum AlgebraHigh Energy Physics - Theorytext