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arXiv 1401.3757math.CT
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范畴的推出,导出极限和余极限

Pushouts of categories, derived limits and colimits

Lukáš Vokřínek

摘要:

在福特的一篇论文中,它声称,任何推出平方的范畴与所有涉及函子内射,有相关的一个确切的“迈耶-Vietoris”序列的派生(co)限制。我们提供了一个反例,以这种一般性的声明。此外,我们构造的迈耶-Vietoris序列下的一些限制,包括著名的情况下推出广场的群单态。

英文摘要:

In a paper by Ford, it is claimed that to any pushout square of categories with all involved functors injective, there is associated an exact "Mayer--Vietoris" sequence of derived (co)limits. We provide a counter-example to this general statement. Further, we construct the Mayer--Vietoris sequence under some restrictions that cover the well-known case of a pushout square of group monomorphisms.

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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