他去就结束 发表于 2025-4-1 01:53:47
http://reply.papertrans.cn/15/1432/143131/143131_61.pngAdj异类的 发表于 2025-4-1 09:01:44
,7. Kapitel Völkerschlachtdenkmal,an a collection of pure subgroups .. indexed by an initial segment of ordinals with the property that .. ≤ .. when . < α and α whenever a is a limit ordinal. Especially, by a . it is meant any union .=U... of pure subgroups, where .. ≤ G . for each n <ω.