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arXiv 1503.02385math.RTmath.RA
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优势维数、导出等价和倾斜模

Dominant dimensions, derived equivalences and tilting modules

Hongxing Chen, Changchang Xi

摘要:

Nakayama猜想指出,一个具有无限支配维数的代数应该是自内射的。基于在导出范畴的背景下理解这一猜想,我们研究了代数在由倾斜模诱导的导出等价下的优势维数,特别是在倾斜过程下优势维数的无穷大性.首先给出了由相对精确序列产生导等价的一种新方法,然后建立了由倾斜模诱导的导等价的关系和优势维数的下界.特别地,我们证明了在一个充分条件下,通过倾斜可以保持主维数的无穷大性,并且得到了一类使得其中一个代数是Kerner-Yamagata意义下的Morita代数而另一个不是的两个代数之间的导等价,同时也是广义对称代数在导等价下是否闭的第一个反例.

英文摘要:

The Nakayama conjecture states that an algebra of infinite dominant dimension should be self-injective. Motivated by understanding this conjecture in the context of derived categories, we study dominant dimensions of algebras under derived equivalences induced by tilting modules, specifically, the infinity of dominant dimensions under tilting procedure. We first give a new method to produce derived equivalences from relatively exact sequences, and then establish relationships and lower bounds of dominant dimensions for derived equivalences induced by tilting modules. Particularly, we show that under a sufficient condition the infinity of dominant dimensions can be preserved by tilting, and get not only a class of derived equivalences between two algebras such that one of them is a Morita algebra in the sense of Kerner-Yamagata and the other is not, but also the first counterexample to a question whether generalized symmetric algebras are closed under derived equivalences.

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