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Generators and closed class of groups. (arXiv:1712.04794v1 [math.GR])

来源于:arXiv
We show that in the category of groups, every singly-generated class which is closed under isomorphisms, direct limits and extensions is also singly-generated under isomorphisms and direct limits, and in particular is co-reflective. We also establish several new relations between singly-generated closed classes. 查看全文>>