2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/73944Let U(g) denote the universal enveloping algebra of a Lie algebra g. We show the existence of a ribbon algebra in a particular deformation of U(g) which leads to a symmetric pre-monoidal category of U(g)-modules.To appear in the Proceedings of XXV ICGTMP (Group 25) (Institute of Physics, London.)Category TheoryMathematical Physicstext