共查询到17条相似文献,搜索用时 78 毫秒
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研究了余代数上余倾斜余模的结构特征,证明了每个余倾斜余模都可以写成不可分解的两两非同构的余模的直和形式,每个余倾斜余模包含所有的内射不可分解模作为直和项.最后构造了余倾斜余模的两个例子. 相似文献
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众所周知, Assem-Smal定理在倾斜理论中有重要的作用.本文的目的是建立一个在余模范畴中的Assem-Smal定理的版本,并通过利用预包络理论来刻画余模范畴中的余倾斜挠类. 相似文献
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本文中,受C.Nastasescu etc.和Y.Miyashita思想的影响,定义了余代数的余倾斜余模,研究得出有限内射维数的余倾斜余模的一些结论. 相似文献
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对偶余模函子()°和余反射余模 总被引:3,自引:0,他引:3
本文给出对偶余模M°的结构刻划及()°作为逆变函子的左正合性.同时引入余反射余模描述余反射余代数,由此研究余反射余代数的同调性质,证明当char(F)=0时,F[x1,...,xn]°上的Serre猜测是成立的,即F[x1,...,xn]°的有限余生成内射余模均为余自由的. 相似文献
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设M是C-余模,C和M分别能被分解成不可分的子余代数和子余模的直和.给出这两个分解式之间的关系,从而给出了C的可约性和可分性与M的相关可约性和可分性之间的关系. 相似文献
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研究了π-H-余模子代数的相关性质。借助对偶原理证明了M 是π-H-余模代数A的π-H-余模子代数当且仅当M⊥是π-H-模余代数A的π-H-模余理想。 相似文献
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本文研究了在Hom-Hopf代数上引入Hom-弱Hopf代数的问题.利用建立弱左H-Hom-余模双代数的方法,获得了Hom-smash余积的代数结构,并证明了Hom-smash余积是Hom-余代数和Hom-弱Hopf代数,推广了由Molnar定义的smash余积Hopf代数. 相似文献
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首先给出Lie余模的直和分解, 然后根据Lie余模理论由Lie余代数构造某些(三角)Lie双代数. 相似文献
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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. 相似文献
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1Intr0ducti0nThegreatattentiontotheQuantumYangBaxterEquation(QYBE)wasfirstlystimulatedbytheinversescatteringpr0blemmethodl5'6].Thenitturnedoutthatmanyofothermathe-maticalobjectsandphysicalm0delsareconnectedwiththeQYBE.Attemptstofindsoluti0nsoftheQYBEinasystematicwayhaveledtothetheoryofquantumgroups[61,andmanypapersaredev0tedtotheconstructionofthesolution,e.g.,8ee[7-10]-Inthispaper,wereviewananaloguetoquantumYang-Baxtermodule['1'1,thatis,quan-tumcomodule.wedevelopsolution8oftheQYBEaPp… 相似文献
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Robert Wisbauer 《代数通讯》2013,41(7):2683-2711
Generalizing the notion of Galois corings, Galois comodules were introduced as comodules P over an A-coring 𝒞 for which P A is finitely generated and projective and the evaluation map μ𝒞:Hom 𝒞 (P, 𝒞) ? S P → 𝒞 is an isomorphism (of corings) where S = End 𝒞 (P). It has been observed that for such comodules the functors ? ? A 𝒞 and Hom A (P, ?) ? S P from the category of right A-modules to the category of right 𝒞-comodules are isomorphic. In this note we use this isomorphism related to a comodule P to define Galois comodules without requiring P A to be finitely generated and projective. This generalises the old notion with this name but we show that essential properties and relationships are maintained. Galois comodules are close to being generators and have common properties with tilting (co)modules. Some of our results also apply to generalised Hopf Galois (coalgebra Galois) extensions. 相似文献
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Stenström introduced the notion of flat object in a locally finitely presented Grothendieck category 𝒜. In this article we investigate this notion in the particular case of the category 𝒜 = C-Comod of left C-comodules, where C is a coalgebra over a field K. Several characterizations of flat left C-comodules are given and coalgebras having enough flat left C-comodules are studied. It is shown how far these coalgebras are from being left semiperfect. As a consequence, we give new characterizations of a left semiperfect coalgebra in terms of flat comodules. Left perfect coalgebras are introduced and characterized in analogy with Bass's Theorem P. Coalgebras whose injective left C-comodules are flat are discussed and related to quasi-coFrobenius coalgebras. 相似文献
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The following are equivalent for a skeletally small abelian Hom-finite category over a field with enough injectives and each simple object being an epimorphic image of a projective object of finite length.
(a) Each indecomposable injective has a simple subobject.
(b) The category is equivalent to the category of socle-finitely copresented right comodules over a right semiperfect and right cocoherent coalgebra such that each simple right comodule is socle-finitely copresented.
(c) The category has left almost split sequences.