Categorical properties and homological conjectures for bounded extensions of algebras

Yongyun Qin, Xiaoxiao Xu, Jinbi Zhang, Guodong Zhou
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引用次数: 0

Abstract

An extension $B\subset A$ of finite dimensional algebras is bounded if the $B$-$B$-bimodule $A/B$ is $B$-tensor nilpotent, its projective dimension is finite and $\mathrm{Tor}_i^B(A/B, (A/B)^{\otimes_B j})=0$ for all $i, j\geq 1$. We show that for a bounded extension $B\subset A$, the algebras $A$ and $B$ are singularly equivalent of Morita type with level. Additively, under some conditions, their stable categories of Gorenstein projective modules and Gorenstein defect categories are equivalent, respectively. Some homological conjectures are also investigated for bounded extensions, including Auslander-Reiten conjecture, finististic dimension conjecture, Fg condition, Han's conjecture, and Keller's conjecture. Applications to trivial extensions and triangular matrix algebras are given. In course of proofs, we give some handy criteria for a functor between module categories induces triangle functors between stable categories of Gorenstein projective modules and Gorenstein defect categories, which generalise some known criteria and hence, might be of independent interest.
代数有界扩展的分类属性和同调猜想
如果$B$-$B$双模块$A/B$是$B$张量零potent的,它的投影维数是无限的,并且对于所有的$i, jgeq 1$,$\mathrm{Tor}_i^B(A/B, (A/B)^{\otimes_B j})=0$,那么有限维代数的扩展$B/子集A$就是有界的。我们证明,对于有界扩展 $B(子集 A$),数组 $A$ 和数组 $B$ 是等价的莫里塔类型有级数组。此外,在某些条件下,它们的戈伦斯坦投影模块稳定范畴和戈伦斯坦缺陷范畴也分别等价。此外,还研究了有界扩展的一些同调猜想,包括奥斯兰德-雷顿猜想、有限维猜想、Fg 条件、韩氏猜想和凯勒猜想。我们给出了琐细扩展和三角矩阵代数的应用。在证明过程中,我们给出了模块范畴之间的函子诱导戈伦斯坦投影模块稳定范畴与戈伦斯坦缺陷范畴之间的三角函子的一些方便的标准,这些标准概括了一些已知的标准,因此可能具有独立的意义。
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