Gorenstein homological algebra of Artin algebras

XW Chen - arXiv preprint arXiv:1712.04587, 2017 - arxiv.org
Gorenstein homological algebra is a kind of relative homological algebra which has been
developed to a high level since more than four decades. In this report we review the basic …

Relative singularity categories I: Auslander resolutions

M Kalck, D Yang - Advances in Mathematics, 2016 - Elsevier
Let R be an isolated Gorenstein singularity with a non-commutative resolution A= End R
(R⊕ M). In this paper, we show that the relative singularity category Δ R (A) of A has a …

Algebras with radical square zero are either self-injective or CM-free

XW Chen - Proceedings of the American Mathematical Society, 2012 - ams.org
An artin algebra is called CM-free provided that all its finitely generated Gorenstein
projective modules are projective. We show that a connected artin algebra with radical …

Galois cohomology of reductive groups over global fields

M Borovoi, T Kaletha, V Hinich - arXiv preprint arXiv:2303.04120, 2023 - arxiv.org
Generalizing Tate's results for tori, we give closed formulas for the abelian Galois
cohomology groups H^ 1_ {ab}(F, G) and H^ 2_ {ab}(F, G) of a connected reductive group G …

Gorenstein categories, singular equivalences and finite generation of cohomology rings in recollements

C Psaroudakis, Ø Skartsæterhagen… - Transactions of the …, 2014 - ams.org
Given an artin algebra $\Lambda $ with an idempotent element $ a $ we compare the
algebras $\Lambda $ and $ a\Lambda a $ with respect to Gorensteinness, singularity …

Frobenius functors and Gorenstein homological properties

XW Chen, W Ren - Journal of Algebra, 2022 - Elsevier
We prove that any faithful Frobenius functor between abelian categories preserves the
Gorenstein projective dimension of objects. Consequently, it preserves and reflects …

On singular equivalences of Morita type

G Zhou, A Zimmermann - Journal of Algebra, 2013 - Elsevier
Stable equivalences of Morita type preserve many interesting properties and are proved to
be the appropriate concept for studying equivalences between stable categories. Recently …

Gorenstein projective modules and recollements over triangular matrix rings

H Li, Y Zheng, J Hu, H Zhu - Communications in Algebra, 2020 - Taylor & Francis
Abstract Let T=(RM 0 S) be a triangular matrix ring with R and S rings and RMS an R–S-
bimodule. We describe Gorenstein projective modules over T. In particular, we refine a result …

The stable monomorphism category of a Frobenius category

XW Chen - arXiv preprint arXiv:0911.1987, 2009 - arxiv.org
For a Frobenius abelian category $\mathcal {A} $, we show that the category ${\rm
Mon}(\mathcal {A}) $ of monomorphisms in $\mathcal {A} $ is a Frobenius exact category; …

Relative singularity categories II: DG models

M Kalck, D Yang - arXiv preprint arXiv:1803.08192, 2018 - arxiv.org
We study the relationship between singularity categories and relative singularity categories
and discuss constructions of differential graded algebras of relative singularity categories …