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arXiv 1104.5689math.CTmath.GR
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图范畴在阿贝尔群范畴中的几乎完全嵌入

An almost full embedding of the category of graphs into the category of abelian groups

Adam J. Przezdziecki

摘要:

我们构造了图的范畴到阿贝尔群范畴的嵌入G,使得对于图X和图Y,我们有Hom(GX,GY)=Z[Hom(X,Y)],这是以Hom(X,Y)为基的自由阿尔贝群.同构在X和Y中是函子的。这样一个嵌入的存在意味着,与一个共同的信念相反,阿贝尔群的范畴与任何其他具体范畴一样复杂和全面。我们使用这种嵌入解决了Isbell的一个老问题,即在极限下闭的阿贝尔群范畴的每一个满子范畴是否是反射的。一个肯定的答案被证明是等价于弱沃彭卡原理,一个大基数公理,这是不可证明的,但被认为是符合标准的集合论。作为嵌入的快速应用,得到了阿贝尔群范畴中的几个已知构造。在修正后的版本中,我们增加了一些结果的Hovey-Palmieri-Alberland问题的存在性的任意局部化的稳定同伦范畴

英文摘要:

We construct an embedding G of the category of graphs into the category of abelian groups such that for graphs X and Y we have Hom(GX,GY)=Z[Hom(X,Y)], the free abelian group whose basis is the set Hom(X,Y). The isomorphism is functorial in X and Y. The existence of such an embedding implies that, contrary to a common belief, the category of abelian groups is as complex and comprehensive as any other concrete category. We use this embedding to settle an old problem of Isbell whether every full subcategory of the category of abelian groups, which is closed under limits, is reflective. A positive answer turns out to be equivalent to weak Vopenka's principle, a large cardinal axiom which is not provable but believed to be consistent with standard set theory. Several known constructions in the category of abelian groups are obtained as quick applications of the embedding. In the revised version we add some consequences to the Hovey-Palmieri-Stricland problem about existence of arbitrary localizations in a stable homotopy category

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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