具有性质(G'_k)的Wakamatsu倾斜模

本文引进了具有性质(G'k)的Wakamatsu倾斜模的概念,并用同调有限子范畴的性质对其进行了刻画．     

具有性质$(G_k)$的Wakamatsu倾斜模

本文引进了具有性质(Gk)的Wakamatsu倾斜模的概念,并用同调有限子范畴的性质对其进行了刻画．所得结果推广了黄兆泳在文献[1]和[11]中的工作．     

偏倾斜模和倾斜模的分次与非分次性质

This paper gives the relationships among partial tilting objects （tilting objects） of categories of graded left A-modules of type G, left A-modules, left Ae-modules and A#-modules, and then proves that for graded partial tilting modules, there exist the Bongartz complements in the category of graded A-modules.     

支撑τ-倾斜模和支撑倾斜模

设∧是一个有限维代数.本文证明了任意支撑倾斜∧-模是支撑τ-倾斜∧-模.反之,任意投射维数小于等于1的支撑τ-倾斜∧-模是支撑倾斜∧-模.特别地,如果∧是遗传的,则任意支撑倾斜∧-模恰好是支撑τ-倾斜∧-模.     

具有有限内射维数的自正交模

证明了与一个余倾斜双模左正交的有限生成模范畴是函子有限的 .引进了左正交维数 ,给出了自正交模具有有限内射维数的一个充要条件和余倾斜模的一个刻画     

BB-倾斜模与Hammock

证明存在Hammock位于有限表示型代数A上BB-倾斜模T_A诱导的AR-箭图上和代数B=End(T_A)的AR-箭图上,并用Hammock对BB-倾斜模T_A进行刻画.     

co-*-模和1-余倾斜模

给出了co-*-模的定义和研究了1-余倾斜模与co-*-模之间的关系,并且设APR是有限型余倾斜双模,如果有fin.dimR<∞或fin.dimA<∞,则|fin.dim R-fin.dim A|≤1.     

关于n-BB-倾斜模的一个注记

设A是一个域k上的基本有限维代数.本文证明了如果AT是一个n-BB-倾斜模,那么TB亦为n-BB-倾斜模,其中B=End(AT).进一步,如果AT是一个n-APR-倾斜模,那么TB亦为n-APR-倾斜模.最后,把本文的结果应用到一个具有n-APR-倾斜模AT的代数A上,得到A是n-表示-有限的(无限的)当且仅当B是n-表示-有限的(无限的).     

两个相关代数上的一对同构模范畴

本文研究了Artin代数A与其子代数模范畴中反变有限子范畴之间的关系.利用范畴同构,获得了代数A上投射维数有限的子模范畴P∞(A)在有限生成的左A模范畴A-mod上反变有限的一个条件,推广了关于子范畴P∞(A)反变有限性的结果.     

具有有限内射维数的广义倾斜模(英文)

设R和S分别为左、右Noether环,RωS为一个平衡的广义倾斜双模.本文给出了1.id_R(ω)≤1的一个等价刻画.并且在1.id_R(ω)和r.id_S(ω)均有限时讨论了Rω或ωS何时是内射的.此外,作为一个推论,得到一些Gorenstein环是QF-环的等价条件.     

Extending Tilting Modules to One-Point Extensions by Projectives

Let k be an algebraically closed field, B be a finite dimensional k-algebra and A be the one-point extension of B by the projective B-module P ₀. We compare the posets 𝒯 _A and 𝒯 _B of tilting A-modules and B-modules, respectively. We prove that the restriction and the extension functors define morphisms of posets r: 𝒯 _A  → 𝒯 _B and e: 𝒯 _B  → 𝒯 _A such that re = id. Moreover, e induces a full embedding of the quiver of 𝒯 _B into that of 𝒯 _A , whose image is closed under successors, and mapping distinct connected components of the first into distinct connected components of the second.     

Cohomology of Subregular Tilting Modules for Small Quantum Groups

Let U be a quantumgroup with divid d powers at root ofunity constructed froma rootsystem R .Let u U b th small quantumgroup.Th cohomologyof u with trivial coefficients was computed by Ginzburg and Kumar.It turns out to be isomorphic to the functions algebra of the nilpotent cone of a semisimpl algebraic group with root system R .In this not we calculate cohomology of u with coefficients in simplest reducible tilting modul with nontrivial cohomology.It appears to b isomorphic to th functions algebra of th closure of the subregular nilpotent orbit.     

Approximations and cotorsion pairs related to a tilting pair

The notion of a tilting pair Miyashita in 2001. It is a useful tool in cotorsion pairs related to a fixed tilting （covariantly） finite subcategory and a tilting pair were given in this paper. over artin algebras was introduced by the tilting theory. Approximations and pair were discussed. A eontravariantly eotorsion pair associated with a fixed     

A Construction of Characteristic Tilting Modules

Associated with each finite directed quiver Q is a quasi-hereditary algebra, the so-called twisted double of the path algebra kQ. Characteristic tilting modules over this class of quasi-hereditary algebras are constructed. Their endomorphism algebras are explicitly described. It turns out that this class of quasi-hereditary algebras is closed under taking the Ringel dual. Received November 15, 2000, Accepted March 5, 2001     

Tilting Preenvelopes and Cotilting Precovers

We relate the theory of envelopes and covers to tilting and cotilting theory, for (infinitely generated) modules over arbitrary rings. Our main result characterizes tilting torsion classes as the pretorsion classes providing special preenvelopes for all modules. A dual characterization is proved for cotilting torsion-free classes using the new notion of a cofinendo module. We also construct unique representing modules for these classes.