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arXiv 0810.4761math.RTmath.CT
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Morita型的导出等价和稳定等价,I

Derived equivalences and stable equivalences of Morita type, I

Wei Hu, Changchang Xi

摘要:

对于自内射代数,Rickard证明了每个导出等价都导出一个Morita型稳定等价。对于一般代数,导出等价何时蕴涵Morita型稳定等价是未知的。本文首先证明了Artin代数$A$和$B$的导出范畴之间的每个导出等价$F$在它们的稳定模范畴之间自然地产生一个函子$\bar{F}$,该函子可用于比较$A$和$B$的某些同调维数,然后给出了函子$\bar{F}$是等价的一个充分条件.此外,如果我们研究域上的有限维代数,则该充分条件保证存在Morita型的稳定等价。这样,我们推广了Rickard的经典结果.此外,我们还提供了几种归纳方法来构造那些导出的等价,诱导稳定等价的Morita型。结果表明,我们可以产生许多(通常不是自内射的)有限维代数,它们既是导出等价的,又是Morita型稳定等价的,因此它们有许多共同的不变量。

英文摘要:

For self-injective algebras, Rickard proved that each derived equivalence induces a stable equivalence of Morita type. For general algebras, it is unknown when a derived equivalence implies a stable equivalence of Morita type. In this paper, we first show that each derived equivalence $F$ between the derived categories of Artin algebras $A$ and $B$ arises naturally a functor $\bar{F}$ between their stable module categories, which can be used to compare certain homological dimensions of $A$ with that of $B$; and then we give a sufficient condition for the functor $\bar{F}$ to be an equivalence. Moreover, if we work with finite-dimensional algebras over a field, then the sufficient condition guarantees the existence of a stable equivalence of Morita type. In this way, we extend the classic result of Rickard. Furthermore, we provide several inductive methods for constructing those derived equivalences that induce stable equivalences of Morita type. It turns out that we may produce a lot of (usually not self-injective) finite-dimensional algebras which are both derived-equivalent and stably equivalent of Morita type, thus they share many common invariants.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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