Monomial bases for quantum affine sl_n

Details Monomial bases for quantum affine sl_n Monomial bases for quantum affine sl_n

2003-07-18

arxiv.org/abs/math/0307257v1

Mathematics

Rings and Algebras

24 pages

Scientific paper

We use the idea of generic extensions to investigate the correspondence between the isomorphism classes of nilpotent representations of a cyclic quiver and the orbits in the corresponding representation varieties. We endow the set $\cal M$ of such isoclasses with a monoid structure and identify the submonoid $\cal M_c$ generated by simple modules. On the other hand, we use the partial ordering on the orbits (i.e., the Bruhat-Chevalley type ordering) to induce a poset structure on $\cal M$ and describe the poset ideals generated by an element of the submonoid $\cal M_c$ in terms of the existence of a certain composition series of the corresponding module. As applications of these results, we generalize some results of Ringel involving special words to results with no restriction on words and obtain a systematic description of many monomial bases for any given quantum affine ${\frak {sl}}_n$.

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