2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/61150We define a quantum analogue of the Grothendieck ring of finite dimensional modules of a quantum affine algebra of simply laced type. The construction is based on perverse sheaves on a variety related to quivers. We get also a new geometric construction of the tensor category of finite dimensional modules of a finite dimensional simple Lie algebra of type A-D-E.20 pagesQuantum Algebratext