Group-like elements in quantum groups, and Feigin's conjecture

Details Group-like elements in quantum groups, and Feigin's conjecture Group-like elements in quantum groups, and Feigin's conjecture

1996-05-12

arxiv.org/abs/q-alg/9605016v1

Mathematics

Quantum Algebra

25 pages, plain TEX

Scientific paper

Let $A$ be an arbitrary symmetrizable Cartan matrix of rank $r$, and ${\bf n}={\bf n_+}$ be the standard maximal nilpotent subalgebra in the Kac-Moody algebra associated with $A$ (thus, ${\bf n}$ is generated by $E_1,\ldots,E_r$ subject to the Serre relations). Let $\hat U_q({\bf n})$ be the completion (with respect to the natural grading) of the quantized enveloping algebra of ${\bf n}$. For a sequence ${\bf i}=(i_1,\ldots,i_m)$ with $1\le i_k\le r$, let $P_{\bf i}$ be a skew polynomial algebra generated by $t_1,\ldots,t_m$ subject to the relations $t_lt_k=q^{C_{i_k,i_l}}t_kt_l$ ($1\le k

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