2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59030All factorizable Lie bialgebra structures on complex reductive Lie algebras were described by Belavin and Drinfeld. We classify the symplectic leaves of the full class of corresponding connected Poisson-Lie groups. A formula for their dimensions is also proved.46 pages, LaTeX2e, Theorem 1.10 proved in the general case, minor misprints correctedQuantum AlgebraSymplectic Geometrytext