2026/06/30 by Tian Vlasic
Mathematics · #math.MG
30 pages, 11 figures
arxiv created 2026/06/30 · arxiv updated 2026/07/31
This paper aims both to provide a unified introduction to d-convexity and to contribute new structural results on metric segments and convexity in metric spaces. After developing the basic theory of metric segments, we study their geometric and topological properties, establishing several structural results, and show that metric segments realize arbitrary closed subsets after the metric is replaced by a topologically equivalent and bounded one. We then examine metrically, Menger, and strictly convex spaces, obtaining new characterizations of strict convexity in terms of an order structure on metric segments and their isometric embeddability into R. Additionally, we offer an exposition of the relationship between d-convexity and other notions of convexity in metric spaces from the standpoint of axiomatic convexity. Finally, we characterize metric spaces in which metric segments are trivial via a "local snowflaking" condition.