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arXiv 2005.08656math.RT
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求主维数的双模方法

A bimodule approach to dominant dimension

Rene Marczinzik

摘要:

本文证明了有限维代数$A$有支配维数至少$n \geq 2$当且仅当正则双模$A$是$n$ -torsionfree当且仅当$A \cong Ω^{n}(\text{Tr}(Ω^{n-2}(V)))$是$A$ -双模,其中$V=\text{Hom}_A(D(A),A)$是\cite{FKY}意义下的规范$A$ -双模.利用这一结果给出了支配维数至少为2的代数的霍赫希尔德同调和上同调的新公式,并证明了第一个Tachikawa猜想、Nakayama猜想和Gorenstein同调代数之间的新关系.

英文摘要:

We show that a finite dimensional algebra $A$ has dominant dimension at least $n \geq 2$ if and only if the regular bimodule $A$ is $n$-torsionfree if and only if $A \cong Ω^{n}(\text{Tr}(Ω^{n-2}(V)))$ as $A$-bimodules, where $V=\text{Hom}_A(D(A),A)$ is the canonical $A$-bimodule in the sense of \cite{FKY}. We apply this to give new formulas for the Hochschild homology and cohomology for algebras with dominant dimension at least two and show a new relation between the first Tachikawa conjecture, the Nakayama conjecture and Gorenstein homological algebra.

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