发表机构
Fukuoka University; Northeastern University(福冈大学; 东北大学)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
本文证明,每个足够小的度量球均为凸的Busemann G-空间是拓扑流形,证明关键为Ivanov的Helly定理,附录含Berestovskii–Halverson–Repovš问题的反例。
AI 中文摘要
我们证明,任何Busemann G-空间,若每个足够小的度量球均为凸,则它是拓扑流形。证明的关键要素是Ivanov的Helly定理。附录包含对Berestovskii–Halverson–Repovš问题的反例。
英文摘要
We prove that any Busemann G-space such that every sufficiently small metric ball is convex is a topological manifold. The key ingredient in the proof is Ivanov's Helly theorem. The appendix contains a counterexample to a question of Berestovskii--Halverson--Repovš.
Commentsadded Corollary 1.2 and Remarks 1.4, 1.5, and 3.8 and made other minor changes