利用同调代数和环模理论的方法,给出n-C-余挠自由模和对偶Auslander转置的若干性质和刻画,并证明了M是n-C-余挠自由模,当且仅当存在Hom R(C,-)下正合的正合列A n-1→…→A 1→A 0→M→0,其中A i∈Add(R C)(0≤i≤n-1),当且仅当存在Hom R...利用同调代数和环模理论的方法,给出n-C-余挠自由模和对偶Auslander转置的若干性质和刻画,并证明了M是n-C-余挠自由模,当且仅当存在Hom R(C,-)下正合的正合列A n-1→…→A 1→A 0→M→0,其中A i∈Add(R C)(0≤i≤n-1),当且仅当存在Hom R(C,-)下正合的正合列C S P n-1→…→C S P 1→C S P 0→M→0,其中P i(0≤i≤n-1)是投射左S-模.研究短正合列0→L→M→N→0中各项的n-C-余挠自由性之间的关系.结果表明:如果L和M是n-C-余挠自由模,那么N是n-C-余挠自由模;如果L和N是n-C-余挠自由模,那么M是n-C-余挠自由模;如果M是n-C-余挠自由模且N是(n+1)-C-余挠自由模,那么L是n-C-余挠自由模.展开更多
Let A be a basic,connected finite dimensional algebra over an algebraically closed field with finite representation type, α(A) be the maximum of set consisting of numbers of indecomposable summands in the middle term...Let A be a basic,connected finite dimensional algebra over an algebraically closed field with finite representation type, α(A) be the maximum of set consisting of numbers of indecomposable summands in the middle term of Auslander Reiten sequences in mod A. In this paper we show that if α(A)=1, then Γ A contains oriented cycles if and only if Γ A contains DT r periodic modules. When α(A)2 we give counterexamples to the assertion.展开更多
Let R be a commutative noetherian local ring. In this paper, we study Gorenstein projective, injective and flat modules with respect to a semidualizing R-module C, and we give some connections between C-Gorenstein hom...Let R be a commutative noetherian local ring. In this paper, we study Gorenstein projective, injective and flat modules with respect to a semidualizing R-module C, and we give some connections between C-Gorenstein homological dimensions and the Auslander categories of R.展开更多
Let_(R)C_(S) be a semidualizing(R,S)-bimodule.Then_(R)C_(S) induces an equivalent between the Auslander class A_(C)(S)and the Bass class B_C(R).Let A and B be free normalizing extensions of R and S respectively.In thi...Let_(R)C_(S) be a semidualizing(R,S)-bimodule.Then_(R)C_(S) induces an equivalent between the Auslander class A_(C)(S)and the Bass class B_C(R).Let A and B be free normalizing extensions of R and S respectively.In this paper,we prove that Hom S(_(B)B_(S),_(R)C_(S))is a semidualizing(A,B)-bimodule under some suitable conditions,and so Hom S(_(B)B_(S),_(R)C_(S))induces an equivalence between the Auslander class AHomS (_(B)B_(S),_(R)C_(S))(B). and the Bass class BHomS (BBS,RCS)(A) Furthermore,under a suitable condition on_(R)C_(S),we develop a generalized Morita theory for Auslander categories.展开更多
Extriangulated categories were introduced by Nakaoka and Palu, which unify exact categories and extension-closed subcategories of triangulated categories. In this paper, we develop the relative homology aspect of Ausl...Extriangulated categories were introduced by Nakaoka and Palu, which unify exact categories and extension-closed subcategories of triangulated categories. In this paper, we develop the relative homology aspect of Auslander bijection in extriangulated categories. Namely, we introduce the notion of generalized ARS-duality relative to an additive subfunctor, and prove that there is a bijective triangle which involves the generalized ARS-duality and the restricted Auslander bijection relative to the subfunctor. We give the Auslander’s defect formula in terms of the generalized ARS-duality, show the interplay of morphisms being determined by objects and a kind of extriangles, and characterize a class of objects which are somehow controlled by this kind of extriangles. We also give a realization for a functor relating the Auslander bijection and the generalized ARS-duality.展开更多
In this article we investigate the relations between the Gorenstein projective dimensions of Λ-modules and their socles for re-minimal Auslander-Gorenstein algebras Λ.First we give a description of projective-inject...In this article we investigate the relations between the Gorenstein projective dimensions of Λ-modules and their socles for re-minimal Auslander-Gorenstein algebras Λ.First we give a description of projective-injective Λ-modules in terms of their socles.Then we prove that a Λ-module N has Gorenstein projective dimension at most n if and only if its socle has Gorenstein projective dimension at most n if and only if N is cogenerated by a projective Λ-module.Furthermore,we show that n-minimal Auslander-Gorenstein algebras can be characterised by the relations between the Gorenstein projective dimensions of modules and their socles.展开更多
We prove Auslander’s defect formula in an exact category,and obtain a commutative triangle involving the Auslander bijections and the generalized Auslander Reiten duality.
Let A and B be Artin R-algebras of finite Cohen-Macaulay type. Then we prove that, if A and B are standard derived equivalent, then their Cohen-Macaulay Auslander algebras are also derived equivalent. And we show that...Let A and B be Artin R-algebras of finite Cohen-Macaulay type. Then we prove that, if A and B are standard derived equivalent, then their Cohen-Macaulay Auslander algebras are also derived equivalent. And we show that Gorenstein projective conjecture is an invariant under standard derived equivalence between Artin R-algebras.展开更多
Hammocks have been introduced by Brenner in order to give a numerical criterion for a finite translation quiver to be the Auslander-Reiten quiver of some representation-finite algebra. Ringel and Vossieck gave a combi...Hammocks have been introduced by Brenner in order to give a numerical criterion for a finite translation quiver to be the Auslander-Reiten quiver of some representation-finite algebra. Ringel and Vossieck gave a combinatorial definition of hammocks, and determined the relationship between hammocks and representation of partial-展开更多
设R为交换 Noether 环,给出关于半对偶R-模W的n-倾斜模的定义.利用同调代数的方法,讨论n-倾斜模(未必有限生成)与n-W-倾斜模之间的关系,研究n-W-倾斜模的若干性质和等价刻画.结果表明,T是n-W-倾斜模当且仅当 Hom R(W,T)是n-倾斜模;T是n...设R为交换 Noether 环,给出关于半对偶R-模W的n-倾斜模的定义.利用同调代数的方法,讨论n-倾斜模(未必有限生成)与n-W-倾斜模之间的关系,研究n-W-倾斜模的若干性质和等价刻画.结果表明,T是n-W-倾斜模当且仅当 Hom R(W,T)是n-倾斜模;T是n-倾斜模当且仅当W R T是n-W-倾斜模.展开更多
文摘利用同调代数和环模理论的方法,给出n-C-余挠自由模和对偶Auslander转置的若干性质和刻画,并证明了M是n-C-余挠自由模,当且仅当存在Hom R(C,-)下正合的正合列A n-1→…→A 1→A 0→M→0,其中A i∈Add(R C)(0≤i≤n-1),当且仅当存在Hom R(C,-)下正合的正合列C S P n-1→…→C S P 1→C S P 0→M→0,其中P i(0≤i≤n-1)是投射左S-模.研究短正合列0→L→M→N→0中各项的n-C-余挠自由性之间的关系.结果表明:如果L和M是n-C-余挠自由模,那么N是n-C-余挠自由模;如果L和N是n-C-余挠自由模,那么M是n-C-余挠自由模;如果M是n-C-余挠自由模且N是(n+1)-C-余挠自由模,那么L是n-C-余挠自由模.
文摘Let A be a basic,connected finite dimensional algebra over an algebraically closed field with finite representation type, α(A) be the maximum of set consisting of numbers of indecomposable summands in the middle term of Auslander Reiten sequences in mod A. In this paper we show that if α(A)=1, then Γ A contains oriented cycles if and only if Γ A contains DT r periodic modules. When α(A)2 we give counterexamples to the assertion.
基金Supported by the National Natural Science Foundation of China(Grant No.11261050)
文摘Let R be a commutative noetherian local ring. In this paper, we study Gorenstein projective, injective and flat modules with respect to a semidualizing R-module C, and we give some connections between C-Gorenstein homological dimensions and the Auslander categories of R.
基金Supported by the Natural Science Foundation of Anhui Province(Grant No.2008085QA03)。
文摘Let_(R)C_(S) be a semidualizing(R,S)-bimodule.Then_(R)C_(S) induces an equivalent between the Auslander class A_(C)(S)and the Bass class B_C(R).Let A and B be free normalizing extensions of R and S respectively.In this paper,we prove that Hom S(_(B)B_(S),_(R)C_(S))is a semidualizing(A,B)-bimodule under some suitable conditions,and so Hom S(_(B)B_(S),_(R)C_(S))induces an equivalence between the Auslander class AHomS (_(B)B_(S),_(R)C_(S))(B). and the Bass class BHomS (BBS,RCS)(A) Furthermore,under a suitable condition on_(R)C_(S),we develop a generalized Morita theory for Auslander categories.
基金Supported by NSFC(Grant No.11901341)Shandong Provincial Natural Science Foundation(Grant No.ZR2021QA001)Youth Innovation Team of Universities of Shandong Province(Grant No.2022KJ314)。
文摘Extriangulated categories were introduced by Nakaoka and Palu, which unify exact categories and extension-closed subcategories of triangulated categories. In this paper, we develop the relative homology aspect of Auslander bijection in extriangulated categories. Namely, we introduce the notion of generalized ARS-duality relative to an additive subfunctor, and prove that there is a bijective triangle which involves the generalized ARS-duality and the restricted Auslander bijection relative to the subfunctor. We give the Auslander’s defect formula in terms of the generalized ARS-duality, show the interplay of morphisms being determined by objects and a kind of extriangles, and characterize a class of objects which are somehow controlled by this kind of extriangles. We also give a realization for a functor relating the Auslander bijection and the generalized ARS-duality.
基金supported by the National Natural Science Foundation of China(11671230,11371165).
文摘In this article we investigate the relations between the Gorenstein projective dimensions of Λ-modules and their socles for re-minimal Auslander-Gorenstein algebras Λ.First we give a description of projective-injective Λ-modules in terms of their socles.Then we prove that a Λ-module N has Gorenstein projective dimension at most n if and only if its socle has Gorenstein projective dimension at most n if and only if N is cogenerated by a projective Λ-module.Furthermore,we show that n-minimal Auslander-Gorenstein algebras can be characterised by the relations between the Gorenstein projective dimensions of modules and their socles.
基金the National Natural Science Foundation of China(Grant No.11901545).
文摘We prove Auslander’s defect formula in an exact category,and obtain a commutative triangle involving the Auslander bijections and the generalized Auslander Reiten duality.
基金Acknowledgements S.Y. Pan was supported by the National Natural Science Foundation of China （Grant No. 11201022）, the Fundamental Research Funds for the Central Universities （2013JBM096, 2013RC027）, and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education. This revision of the first draft was done when S. Y. Pan was a postdoctor of Bishop＇s University, he would like to thank Professor Thomas Briistle for his warm hospitality. X. J. Zhang was supported by National Natural Science Foundation of China （Grant No. 11101217）.
文摘Let A and B be Artin R-algebras of finite Cohen-Macaulay type. Then we prove that, if A and B are standard derived equivalent, then their Cohen-Macaulay Auslander algebras are also derived equivalent. And we show that Gorenstein projective conjecture is an invariant under standard derived equivalence between Artin R-algebras.
基金This research is supported by the National Education CommissionNatural Science Foundation of Fujian Province.
文摘Hammocks have been introduced by Brenner in order to give a numerical criterion for a finite translation quiver to be the Auslander-Reiten quiver of some representation-finite algebra. Ringel and Vossieck gave a combinatorial definition of hammocks, and determined the relationship between hammocks and representation of partial-
文摘设R为交换 Noether 环,给出关于半对偶R-模W的n-倾斜模的定义.利用同调代数的方法,讨论n-倾斜模(未必有限生成)与n-W-倾斜模之间的关系,研究n-W-倾斜模的若干性质和等价刻画.结果表明,T是n-W-倾斜模当且仅当 Hom R(W,T)是n-倾斜模;T是n-倾斜模当且仅当W R T是n-W-倾斜模.
