2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59619Free Hopf modules and bimodules over a bialgebra are studied with some details. In particular, we investigate a duality in the category of bimodules in this context. This gives the correspondence between Woronowicz's quantum Lie algebra and algebraic vector fields.12 pages, latex2e (latexsym,amsthm,amsmath), no figures, accepted for publication in Int. J. Theoret. Phys. 39 no10 (2000)Quantum AlgebraMathematical Physics16W30;17B37;81R50;16S40text