Extension groups between atoms and objects in locally noetherian Grothendieck category

Extension groups between atoms and objects in locally noetherian Grothendieck category
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局部诺特格罗腾迪克范畴中原子和物体之间的可拓群

DOI:
10.1016/j.jalgebra.2014.09.009
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发表时间:
2015
期刊:
影响因子:
0.9
通讯作者:
Ryo Kanda
Ryo Kanda
中科院分区:
数学3区
文献类型:
--
作者:
萩生翔大;神崎素樹;Ryo Kanda;Ryo Kanda;Ryo Kanda;Ryo Kanda;Ryo Kanda;Ryo Kanda;Ryo Kanda;Ryo Kanda

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我们将局部诺特Grothendieck范畴中的原子和对象之间的扩张群定义为斜域上的模。我们证明了原子与物体之间的第i个扩张群的维数与物体相对于原子的第i个Bass数一致。作为应用,我们给出了E-稳定子范畴在任意直和与直和项下闭的子范畴与原子谱子集之间的双射,并证明了这些子范畴在扩张、满态核和单态上核下也是闭的.我们展示了诺特代数中素理想理论的一些关系。
We define the extension group between an atom and an object in a locally noetherian Grothendieck category as a module over a skew field. We show that the dimension of thei-th extension group between an atom and an object coincides with thei-th Bass number of the object with respect to the atom. As an application, we give a bijection between the E-stable subcategories closed under arbitrary direct sums and direct summands and the subsets of the atom spectrum and show that such subcategories are also closed under extensions, kernels of epimorphisms, and cokernels of monomorphisms. We show some relationships to the theory of prime ideals in the case of noetherian algebras.
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