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arXiv 1810.10491math.MG
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赋范回转群的度量结构

On metric structures of normed gyrogroups

Teerapong Suksumran

摘要:

本文证明了$n$维欧几里得空间$\mathbb{R}^n$中的开单位球存在与Poincaré和Beltrami $-$ Klein度量相容的类范数函数.这导致了赋范回转群的概念,类似于文献中的赋范群。然后我们研究了赋范回转群的拓扑和几何结构。特别地,我们证明了赋范回转群是齐次的,并形成左不变度量空间,并导出了Mazur $-$ Ulam定理的一个版本。利用右回转平移不等式和Klee条件,给出了赋范回转群为拓扑回转群的若干充分条件.

英文摘要:

In this article, we indicate that the open unit ball in $n$-dimensional Euclidean space $\mathbb{R}^n$ admits norm-like functions compatible with the Poincaré and Beltrami$-$Klein metrics. This leads to the notion of a normed gyrogroup, similar to that of a normed group in the literature. We then examine topological and geometric structures of normed gyrogroups. In particular, we prove that the normed gyrogroups are homogeneous and form left invariant metric spaces and derive a version of the Mazur$-$Ulam theorem. We also give certain sufficient conditions, involving the right-gyrotranslation inequality and Klee's condition, for a normed gyrogroup to be a topological gyrogroup.

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