共查询到20条相似文献,搜索用时 46 毫秒
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本文在单项代数中基于维数树的概念引入了整体和有限整体维数树以及维数代数的概念,应用这些概念进而给出了计算单项代数同调维的更有效的组合算法. 相似文献
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设A是有限表示型遗传代数A=kQ的投射模范畴proj A上的根双模rad(-,-)所对应的拟遗传代数,基于Bardzell构造的极小投射双模分解,A的各阶Hochschild上同调群的维数被清晰地计算. 相似文献
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对于任意的正数M以及正整数d≥4,存在直径为d的i-边连通无环图G使得ζ(G)≥M,其中ζ(G)是G的Betti亏数,i=1,2,3。 相似文献
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设Aq=k/(x2,xy+qyx,y2)是含有两个变量的广义外代数,基于Buch- weitz等人构造的极小投射双模解,广义外代数的各阶Hochschild同调群的维数被清晰地计算. 相似文献
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本文主要是受了Eisenbud的启发,在其研究的基础上进一步研究了外代数上有线性周期自由分解的不可分解模的表示矩阵,并给出了其表示矩阵的几个较好的形式. 相似文献
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本文对外代数上复杂度为2的不可分解循环Koszul模M的极小投射分解进行了分析,构造出了基映射对应的矩阵的一种标准形式,进而刻划出了其合冲ΩM的滤链结构. 相似文献
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Yue-hui ZHANG~ 《中国科学A辑(英文版)》2007,50(8):1129-1140
Let A be a monomial quasi-hereditary algebra with a pure strong exact Borel subalgebra B.It is proved that the category of induced good modules over B is contained in the category of good modules over A;that the characteristic module of A is an induced module of that of B via the exact functor-(?)_B A if and only if the induced A-module of an injective B-module remains injective as a B-module.Moreover,it is shown that an exact Borel subalgebra of a basic quasi-hereditary serial algebra is right serial and that the characteristic module of a basic quasi-hereditary serial algebra is exactly the induced module of that of its exact Borel subalgebra. 相似文献
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Vladimir Mazorchuk 《Compositio Mathematica》1999,115(1):21-35
We constuct and investigate a structure of Verma-like modules over generalized Witt algebras. We also prove Futorny-like theorem for irreducible weight modlues whose dimensions of the weight spaces are uniformly bounded. 相似文献
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A. V. Tsarev 《Mathematical Notes》2006,80(3-4):417-427
The projective, flat, and generating modules over the ring of pseudorational numbers are described. For the projective modules, a complete independent system of invariants is constructed. 相似文献
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In this paper, a class of generalized Verma modules M(V) over some Block type Lie algebra ℬ(G) are constructed, which are induced from nontrivial simple modules V over a subalgebra of ℬ(G). The irreducibility of M(V) is determined.
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Gena Puninski 《Proceedings of the American Mathematical Society》2004,132(7):1891-1898
We prove that over every non-domestic string algebra over a countable field there exists a superdecomposable pure-injective module.
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WANG Minxiong~ LIN Yanan~.Department of Mathematics Huaqiao University Quanzhou China.Department of Mathematics Xiamen University Xiamen China 《中国科学A辑(英文版)》2005,48(1):97-106
Let T be a tilting A-module over a path algebra of Dynkin type.We prove thatif the indecomposable direct summands of T are in the different (?)-orbits of the AR-quiverof A,then T is a complete slice module. 相似文献
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We consider a class of algebras whose Auslander-Reiten quivers have starting components that are not generalized standard.
For these components we introduce a generalization of a slice and show that only in finitely many cases (up to isomorphism)
a slice module is a tilting module.
The first named author was supported by the Polish Scientific Grant KBN No 1 P03A 018 27 相似文献