English

Categorical characterisations of quasi-isometric embeddings

Metric Geometry 2024-11-14 v1 Category Theory Group Theory Geometric Topology

Abstract

We characterise the (closeness classes of) quasi-isometric embeddings as the regular monomorphisms in the coarsely Lipschitz category, formalising the notion that they are isomorphisms onto their image. Furthermore, we prove that the coarsely Lipschitz category is coregular, and hence admits an (Epi, RegMono)--orthogonal factorisation system. Consequently, quasi-isometric embeddings are equivalently characterised as the effective, strong, or extremal monomorphisms. Finally, we prove that the coarsely Lipschitz category is not coexact in the sense of Barr.

Keywords

Cite

@article{arxiv.2411.08501,
  title  = {Categorical characterisations of quasi-isometric embeddings},
  author = {Robert Tang},
  journal= {arXiv preprint arXiv:2411.08501},
  year   = {2024}
}

Comments

19 pages, 1 appendix