On the Decomposition of Hopf Module Coalgebra

In1969,Sweedler[1]giventhedecompositiontheoreyofcoalgebraswhicharecocommu-tative.In1975,Kaplansky[2]showedthatanycoalgebracanbeuniquelydecomposedintoadirectsumofitsindecomposablesubcoalgebras.From1978to1992,Shudo[3]andXu[4]consructuredtheindecomposabledirectsumcomponentsofacoalggebra,viadefineequivalenceralationforthesetofsimplesubcoalgebras.Asweknow,themodolecoalgebraisthennaturalgeneralizationofcoalgebra.AndittakesplayanimportentroleintheDrinfelddouble.Inthispaper,wediscussthedecompositio…     

模与余模间的对偶

本文讨论模的对偶余模，把代数的（有限）对偶余代数的有关结论完整地推广到模的对偶余模上．作为这个理论的应用，我们给出一个例子说明Ｈ－模代数Ａ的对偶Ａ°不一定是Ｈ°－余模余代数     

H－弱余模余代数和交叉余积

引进了交叉积的对偶交叉余积，证明了：余Ｃｌｅｆｔ模余代数的结构定理（作为余代数）；如果为Ｈｏｐｆ代数余可裂正合序列，那么作为Ｈｏｐｆ代数，由此有强增广余代数Ｃ的结构定理（作为双代数）；如果为Ｈｏｐｆ代数可裂正合序列，那么作为Ｈｏｐｆ代数并简单地讨论了Ｃ×αＨ的余半单性．     

弱Doi—Hopf群模的半单性

在弱Hopf群余代数情形中,讨论了一簇从弱Doi-Hopf群模范畴到某个代数上的模范畴忘却函子的可分性,诱导出弱Doi-Hopf群模数据的正规化积分概念,证明了正规化积分存在性是忘却函子可分的判别准则.所得结果在弱量子Yetter-Drinfel'd群模范畴及弱相对Hopf群模范畴中有应用价值.     

On the Koszul Modules of Exterior Algebras

We prove that the Koszul modules over an exterior algebra can be filtered by the cyclic Koszul modules. We also introduce the cyclic dimension vector as invariants for studying the Koszul modules over an exterior algebra.     

弱模余代数的结构定理

设H为弱Hopf代数,C为弱右H-模余代数,令C=C/C·ker L.利用Smash余积来研究弱模余代数上的结构定理,并给出了C与C×H作为余代数同构的条件.     

［C，H］－Hopf模与模余代数的结构定理

本文首先利用ｃｏｉｎｔｅｇｒａｌ和ｃｏｃｌｅｆｔ模余代数概念，得到Ｈ为Ｈｏｐｆ代数当且仅当Ｈ作为Ｈ－模余代数是ｃｏｃｌｅｆｔ以及模余代数的一些性质．然后，设Ｃ为Ｈ－模余代数．令Ｃ＝Ｃ／Ｃｋｅｒε则有．最后，证明了结构定理：当Ｃ为ｃｏｃｌｅｆｔＨ－模余代数时，作为余代数有同构：Ｃ≌Ｃ×Ｈ     

On the Category of Koszul Modules of Complexity One of an Exterior Algebra

In this paper, we prove that there is a natural equivalence between the category F1（x） of Koszul modules of complexity 1 with filtration of given cyclic modules as the factor modules of an exterior algebra A = ∧V of an m-dimensional vector space, and the category of the finite-dimensional locally nilpotent modules of the polynomial algebra of m - 1 variables.     

系数在基本Harish—Chandra模中的Virasoro代数的上同调群

设ｇ为特征为０的二次闭域上的Ｖｉｒａｓｏｒｏ代数。本文决定了Ｈ＾１（ｇ，Ｍ（４，１）），Ｈ＾２（ｇ，Ｍ（４，２））及Ｈ＾２（ｇ，ＭＬ）的结构，其中Ｍ（４，１），Ｍ（４，２）为两类基本Ｈａｒｉｓｈ－Ｃｈａｎｄｒａ模，ＭＬ为无常数项单变量Ｌａｕｒｅｎｔ多项式。     

模余代数的结构定理(英文)

This paper,mainly gives the structure theorem for module coalgebras by a kind of new method,and deletes the condition that the antipode S of the Hopf algebra H is bijective.     

Hom-Hopf代数上的余代数结构

Let(C, α) and(H, β) be Hom-bialgebras and ω : C H → H  C a linear map.We introduce the concept of a Hom-ω-crossed coproduct(Cω σ H, γ) and we give necessary and sufficient conditions for the new object to be a Hom-Hopf algebra.     

Constructing the Co cyclic Structures for Crossed Copro duct Coalgebras

In this paper, we construct a cocylindrical object associated to two coal-gebras and a cotwisted map. It is shown that there exists an isomorphism between the cocyclic object of the crossed coproduct c...     

Group Entwining Structures and Group Coalgebra Galois Extensions

Abstract

The notions of group coalgebra Galois extension and group entwining structure are defined. It is proved that any group coalgebra Galois extension induces a unique group-entwining map ψ = {ψ_{α, β}}_{α, β∈π} compatible with the right group coaction, generalizing the recent work of Brzeziński and Hajac [Brzeziński, T., Hajac, P. M. (1999). Coalgebra extensions and algebra coextensions of Galois type. Comm. Algebra 27:1347–1368].     

广义伪余扭曲余代数

研究了余扭曲子的性质,并给出余扭曲子的推广形式-伪余扭曲子,进而给出了伪余扭曲子上的广义伪余扭曲余代数.     

m-循环复形范畴的Bridgeland-Hall代数的余代数结构

设A是一个遗传Abel范畴且■是A的投射对象构成的满子范畴.本文主要研究胁循环复形范畴C_m(■)的Bridgeland-Hall代数的余代数结构(其中m≥2).受Yanagida工作的启发,我们在C_m(■)上定义一个新的正合结构,由此得到了其Bridgeland-Hall代数的余代数结构.同时,证明了存在A的扩展Ringel-Hall代数到m-循环复形范畴C_m(■)的Bridgeland-Hall代数的余代数嵌入.     

On Gorenstein coalgebras

We investigate the comodule representation category over the Morita-Takeuchi context coalgebra Γ and study the Gorensteinness of Γ. Moreover, we determine explicitly all Gorenstein injective comodules over the Morita-Takeuchi context coalgebra Γ and discuss the localization in Gorenstein coalgebras. In particular, we describe its Gabriel quiver and carry out some examples when the Morita-Takeuchi context coalgebra is basic.     

On corepresentations of multiplier Hopf algebras

We present a general construction producing a unitary corepresentation of a multiplier Hopf algebra in itself and study RR-corepresentations of twisted tensor coproduct multiplier Hopf algebra. Then we investigate some properties of functors, integrals and morphisms related to the categories of the crossed modules and covariant modules over multiplier Hopf algebras. By doing so, we can apply our theory to the case of group-cograded multiplier Hopf algebras, in particular, the case of Hopf group-coalgebras.