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arXiv 2006.16451math.RT
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三正合范畴中的几乎可裂序列

Almost split sequences in tri-exact categories

Shiping Liu, Hongwei Niu

摘要:

我们将研究三正合范畴,即三角范畴的扩张闭子范畴中几乎可裂序列的存在性。我们的结果统一和推广了阿贝尔范畴和正合范畴(即阿贝尔范畴的扩张闭子范畴)中几乎可裂序列的存在性定理,以及三角化范畴中几乎可裂三角形的存在性定理.作为应用,我们将得到关于具有单位元的代数或由具有关系元给出的局部有限维代数上所有模的导出范畴中几乎可裂序列存在性的一些新结果.

英文摘要:

We shall study the existence of almost split sequences in tri-exact categories, that is, extension-closed subcategories of triangulated categories. Our results unify and extend the existence theorems for almost split sequences in abelian categories and exact categories (that is, extension-closed subcategories of abelian categories), and those for almost split triangles in triangulated categories. As applications, we shall obtain some new results on the existence of almost split sequences in the derived categories of all modules over an algebra with a unity or a locally finite dimensional algebra given by a quiver with relations.

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