对偶Auslander转置的同调性质
Homological Aspects of the Dual Auslander Transpose
摘要:
作为模的Auslander转置的对偶,我们引入并研究了模关于半对偶模$C$的余转置.然后利用它引入了$n$ - $C$ -余挠自由模,并证明了$n$ - $C$ -余挠自由模具有$n$ -余挠自由模的许多对偶性质.特别是,我们表明,$n$ - $C$ -cotorsionfree模块是有用的,在表征巴斯类和调查的逼近论的模块。此外,我们还研究了Artin代数上的$n$ -无余挠模,并否定地回答了Huang和Huang在2012年提出的一个公开问题.
英文摘要:
As a dual of the Auslander transpose of modules, we introduce and study the cotranspose of modules with respect to a semidualizing module $C$. Then using it we introduce $n$-$C$-cotorsionfree modules, and show that $n$-$C$-cotorsionfree modules possess many dual properties of $n$-torsionfree modules. In particular, we show that $n$-$C$-cotorsionfree modules are useful in characterizing the Bass class and investigating the approximation theory for modules. Moreover, we study $n$-cotorsionfree modules over artin algebras and answer negatively an open question of Huang and Huang posed in 2012.
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