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arXiv 0810.3740math.QAmath.RAmath.RT
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代数中的抽象积分:余代数、霍普夫代数和紧群

Abstract integrals in algebra: coalgebras, Hopf algebras and compact groups

Miodrag C. Iovanov

摘要:

推广了纯(余)代数下紧群和霍普夫代数积分的存在唯一性的结果,得到了(拟)-余Frobenius和半完全余代数的一系列新结果.对于余代数$C$,我们引入了与右$C$ -余$M$相关联的广义积分空间$\int_M=\Hom^C(C,M)$,研究了对于所有$M$的“积分唯一性”$\dim(\int_M)\leq \dim(M)$与“积分存在性”$\dim(\int_M)\geq \dim(M)$之间的联系,以及$C$的表示论性质:(拟)-co-Frobenius,半完全.证明了余代数是余Frobenius的充要条件是对任意有限维$M$,积分的存在唯一性成立.我们给出了解释$\int_M$的余代数的代表性功能的一个紧凑的群体-他们将是“量子”不变的向量积分。作为应用,给出了余Frobenius余代数和霍普夫代数的一些著名特征的新证明,以及霍普夫代数中积分的唯一性.我们也给出了无限维代数的表示论的结论。我们给出了一个广泛的类的例子表明,该文件的结果是最好的可能。这些例子然后被用来给所有以前未知的各种重要类的余代数之间的连接出现在文献中。

英文摘要:

We generalize the results on existence and uniqueness of integrals from compact groups and Hopf algebras in a pure (co)algebraic setting, and find a series of new results on (quasi)-co-Frobenius and semiperfect coalgebras. For a coalgebra $C$, we introduce the generalized space of integrals $\int_M=\Hom^C(C,M)$ associated to a right $C$-comodule $M$ and study connections between "uniqueness of integrals" $\dim(\int_M)\leq \dim(M)$ and "existence of integrals" $\dim(\int_M)\geq \dim(M)$ for all $M$ and representation theoretic properties of $C$: (quasi)-co-Frobenius, semiperfect. We show that a coalgebra is co-Frobenius if and only if existence and uniqueness of integrals holds for any finite dimensional $M$. We give the interpretation for $\int_M$ for the coalgebra of representative functions of a compact group - they will be "quantum"-invariant vector integrals. As applications, new proofs of well known characterizations of co-Frobenius coalgebras and Hopf algebras are obtained, as well as the uniqueness of integrals in Hopf algebras. We also give the consequences for the representation theory of infinite dimensional algebras. We give an extensive class of examples which show that the results of the paper are the best possible. These examples are then used to give all the previously unknown connections between the various important classes of coalgebras appearing in literature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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