No Connectedness Lemma for Alexandrov spaces

Since its introduction in 2003, Wilking's Connectedness Lemma has become a powerful tool in the study of manifolds with positive sectional curvature. In recent work of the authors, this has been extended to orbifolds. The purpose of this note is to exhibit counterexamples in the class of Alexandrov spaces for the Connectedness Lemma in both its ordinary and dual formulation. This answers a 2007 question of Wilking.

Authors

Publication Details

Journal
arXiv (Cornell University)
Published
2026-10-27
DOI
https://doi.org/10.48550/arxiv.2610.37476
Primary Topic
Geometric Analysis and Curvature Flows
Type
preprint
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preprint

No Connectedness Lemma for Alexandrov spaces

Dennis Wulle, Jan Nienhaus
arXiv (Cornell University)
Geometric Analysis and Curvature Flows
preprint

No Connectedness Lemma for Alexandrov spaces

Dennis Wulle, Jan Nienhaus
preprint en

Abstract

Since its introduction in 2003, Wilking's Connectedness Lemma has become a powerful tool in the study of manifolds with positive sectional curvature. In recent work of the authors, this has been extended to orbifolds. The purpose of this note is to exhibit counterexamples in the class of Alexandrov spaces for the Connectedness Lemma in both its ordinary and dual formulation. This answers a 2007 question of Wilking.

arXiv (Cornell University)
Geometric Analysis and Curvature Flows
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No Connectedness Lemma for Alexandrov spaces — Dennis Wulle, Jan Nienhaus · arXiv (Cornell University) (2026) | TGRS Research Map | TGRS