Collapsibility of CAT(0) spaces

Karim Adiprasito, Bruno Benedetti

Research output: Contribution to journalArticle

Abstract

Collapsibility is a combinatorial strengthening of contractibility. We relate this property to metric geometry by proving the collapsibility of any complex that is CAT (0) with a metric for which all vertex stars are convex. This strengthens and generalizes a result by Crowley. Further consequences of our work are:(1)All CAT (0) cube complexes are collapsible.(2)Any triangulated manifold admits a CAT (0) metric if and only if it admits collapsible triangulations.(3)All contractible d-manifolds (d≠ 4) admit collapsible CAT (0) triangulations. This discretizes a classical result by Ancel–Guilbault.

Original languageEnglish (US)
Pages (from-to)181-199
Number of pages19
JournalGeometriae Dedicata
Volume206
Issue number1
DOIs
StatePublished - Jun 1 2020

Keywords

  • CAT (0) spaces
  • Collapsibility
  • Convexity Evasiveness
  • Discrete Morse theory
  • Triangulations

ASJC Scopus subject areas

  • Geometry and Topology

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