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arXiv 1409.3605math.RAmath.AC
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结合环上的稳定同调

Stable homology over associative rings

Olgur Celikbas, Lars Winther Christensen, Li Liang, Greg Piepmeyer

摘要:

分析了结合环上的稳定同调,得到了Artin代数和交换诺特环上的结果.我们的研究对这些类进行了类似的开发;为了简单起见,我们在这里只讨论后者。稳定同源性是Tate同源性的广义推广。消失的稳定同源检测类环-其中Gorenstein环,泰特同源的原始域。与环的Gorensteinness密切相关的是Auslander的模的G-维数。我们发现,消失的稳定的同源检测模块的有限G-维。这是第一个特征,这样的模块在消失的(共)同源性。稳定同调,就像绝对同调,Tor,是一个两变量的理论。它可以从一个模块的平坦分辨率与另一个模块的内射分辨率一起计算。这表明,稳定的同源性并不像Tor那样平衡。事实上,我们证明了一个环是Gorenstein当且仅当稳定的同源平衡。

英文摘要:

We analyze stable homology over associative rings and obtain results over Artin algebras and commutative noetherian rings. Our study develops similarly for these classes; for simplicity we only discuss the latter here. Stable homology is a broad generalization of Tate homology. Vanishing of stable homology detects classes of rings---among them Gorenstein rings, the original domain of Tate homology. Closely related to gorensteinness of rings is Auslander's G-dimension for modules. We show that vanishing of stable homology detects modules of finite G-dimension. This is the first characterization of such modules in terms of vanishing of (co)homology alone. Stable homology, like absolute homology, Tor, is a theory in two variables. It can be computed from a flat resolution of one module together with an injective resolution of the other. This betrays that stable homology is not balanced in the way Tor is balanced. In fact, we prove that a ring is Gorenstein if and only if stable homology is balanced.

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