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arXiv math/9805139math.QAmath-phmath.MP
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A型量子群上的微分霍普夫代数

Differential Hopf Algebras on Quantum Groups of Type A

Axel Schueler

摘要:

设A是一个霍普夫代数,$Gamma$是A上的一阶双共变微分学.已知有三种可能构造一个包含$Gamma$作为其一阶部分的微分霍普夫代数$Gamma^wedge$,即泛外代数,第二反对称外代数和Woronowicz外代数.设A是量子群GL_q(N)或SL_q(N)中的一个.设$Gamma$是A上的N^2维双共变一阶微分演算之一,q是超越的。对于Woronowicz外代数,我们确定了左不变和双不变k-形式空间的维数。双不变形式是封闭的,代表不同的de Rham上同调类。双不变形式的代数是分次反交换的。当N>2时,这三个微分霍普夫代数重合.然而,对于SL_q(2)上的4D_ \pm -演算,泛微分霍普夫代数严格大于Woronowicz外代数.双不变1-形式不是封闭的。

英文摘要:

Let A be a Hopf algebra and $Gamma$ be a bicovariant first order differential calculus over A. It is known that there are three possibilities to construct a differential Hopf algebra $Gamma^wedge$ that contains $Gamma$ as its first order part; namely the universal exterior algebra, the second antisymmetrizer exterior algebra, and Woronowicz' external algebra. Now let A be one of the quantum groups GL_q(N) or SL_q(N). Let $Gamma$ be one of the N^2-dimensional bicovariant first order differential calculi over A and let q be transcendental. For Woronowicz' external algebra we determine the dimension of the space of left-invariant and of bi-invariant k-forms. Bi-invariant forms are closed and represent different de Rham cohomology classes. The algebra of bi-invariant forms is graded anti-commutative. For N>2 the three differential Hopf algebras coincide. However, in case of the 4D_\pm-calculi on SL_q(2) the universal differential Hopf algebra is strictly larger than Woronowicz' external algebra. The bi-invariant 1-form is not closed.

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