Hopf ideals of the generalized quantum double associated to skew-paired Nichols algebras

Details Hopf ideals of the generalized quantum double associated to skew-paired Nichols algebras Hopf ideals of the generalized quantum double associated to skew-paired Nichols algebras

2009-11-12

arxiv.org/abs/0911.2282v4

Mathematics

Quantum Algebra

2 pages. v4 (final version); Changed the title, refomulated Remark 7.3 as Corollary 7.3, and added Corollary 7.4

Scientific paper

The quantized enveloping algebra $U_q$ is constructed as a quotient of the generalized quantum double $ U^{\leq 0}_q \cmdbicross_{\tau} U^{\geq 0}_q $ associated to a natural skew pairing $ \tau : U^{\leq 0}_q \otimes U^{\geq 0}_q \to k $. This double is generalized by $\cmdcalD = (\cmdfrakB (V) \cmddotrtimes F) \cmdbicross_{\tau} (\cmdfrakB (W) \cmddotrtimes G)$, where $F$, $G$ are abelian groups, $ V \in {}^F_F \cmdcalYD $, $ W \in {}^G_G \cmdcalYD $ are Yetter-Drinfeld modules and $ \cmdfrakB (V) $, $ \cmdfrakB (W) $ are their Nichols algebras. We prove some results on Hopf ideals of $ \cmdcalD $, including a characterization of what we call thin Hopf ideals. As an application we give an explicit description of those minimal quasitriangular pointed Hopf algebras in characteristic zero which are generated by skew primitives.

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