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arXiv 1002.4312math.AT
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分次偏序集上的同调代数

Homological Algebra on Graded Posets

Antonio Diaz Ramos

摘要:

本文描述了从分次偏序集到阿贝尔群的函子范畴中的投射。基于这种描述,我们定义了一个相关的条件,伪射影,我们证明了这个条件是足够的消失所得出的直接限制。我们应用这个结果推导出一个推广版本的定理Whitehead推出。还考虑了逆极限的对偶结果。给出了偏序集积分上同调的两种计算方法:局部方法和整体方法。只要每个对象下的子偏序集具有一定的结构,局部方法就适用。这是单纯复形、单纯样偏序集和有限群的奎伦复形的情况。整体方法与莫尔斯理论有关。

英文摘要:

We describe the projectives in the category of functors from a graded poset to abelian groups. Based on this description we define a related condition, pseudo-projectivity, and we prove that this condition is enough for the vanishing of the derived direct limits. We apply this result to deduce a generalized version of a theorem of Whitehead for the pushout. The dual results for inverse limits are also considered. We present two methods to compute integral cohomology of posets, a local one a and a global one. The local method is applicable as soon as the sub-posets under each object possess certain structure. This is the case for simplicial complexes, simplex-like posets and for Quillen's complex of a finite group. The global method is related to Morse Theory.

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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