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Closed subsets of a $\mathrm{CAT}(0)$ $2$–complex are intrinsically $\mathrm{CAT}(0)$

Russell Ricks
Algebraic & Geometric Topology 21 (2021) 1723–1744
DOI: 10.2140/agt.2021.21.1723
Bibliography
1 M R Bridson, A Haefliger, Metric spaces of non-positive curvature, 319, Springer (1999) MR1744486
2 R G Hanlon, E Martínez-Pedroza, Lifting group actions, equivariant towers and subgroups of non-positively curved groups, Algebr. Geom. Topol. 14 (2014) 2783 MR3276848
3 A Lytchak, S Wenger, Isoperimetric characterization of upper curvature bounds, Acta Math. 221 (2018) 159 MR3877021
4 R Ricks, Planar subspaces are intrinsically CAT(0), Tsukuba J. Math. 44 (2020) 139 MR4194196