Abstract
We provide a classification and an explicit realization of all simple GelfandâTsetlin modules of the complex Lie algebra [Formula: see text]. The realization of these modules, including those with infinite-dimensional weight spaces, is given via regular and derivative GelfandâTsetlin tableaux. Also, we show that all simple GelfandâTsetlin [Formula: see text]-modules can be obtained as subquotients of localized GelfandâTsetlin [Formula: see text]-injective modules.
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