2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/79657In this paper, we study finite dimensional quotients of the Hopf algebra U_{q}(sl_{2}) at fourth root of unity. We give explicitly all the corresponding automorphisms, real forms and idempotents.24 pages, talk presented by Daniel Kastler at the conference "Analysis on infinite-dimensional Lie groups and algebras", Marseille, September 1997Quantum Algebratext