The globalization conjecture for Alexandrov spaces

Let YY be an nn-dimensional length metric space. For a subset UY\mathcal{U}\subseteq Y, set A=YU\mathcal{A}=Y\setminus\mathcal{U}, and write UAlexlocn(κ)\mathcal{U}\in\operatorname{Alex}_{\mathrm{loc}}^n(\kappa) when every point of U\mathcal{U} has a neighborhood on which κ\kappa-Toponogov comparison holds. Globalization conjecture. If

Hn1(A)=0\mathcal{H}^{n-1}(\mathcal{A})=0

and, for every pAp\in\mathcal{A}, the tangent cone Tp(Y)T_p(Y) exists and is isometric to a metric cone C(Σ)Alexn(0)C(\Sigma)\in\operatorname{Alex}^{n}(0), then YAlexn(κ)Y\in\operatorname{Alex}^{n}(\kappa). This would extend the stated globalization theorem, which assumes that the exceptional set is discrete, and would imply the paper's earlier gluing conjecture together with the results established in its separation and involutional gluing sections.

Sources & referencesView supporting material

Primary source

Jian Ge and Nan Li, “Gluing of multiple Alexandrov spaces”, arXiv:2003.09919 (2020).

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