2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/153408Crystal base of the level 0 part of the modified quantum affine algebra $\widetilde U_q(\widehat{sl_2})_0$ is given by path. Weyl group actions, extremal vectors and crystal structure of all irreducible components are described explicitly.39 pages, LaTexQuantum Algebratext