The curvature criterion for doubling geodesically convex subsets
Let be an space, and let be a geodesically convex open subset of with . Let be the measure on defined by
for all , where and are the two copies of . Doubling curvature criterion. The measured doubled space satisfies if and only if
This is formulated as an if-and-only-if conjecture in the supplied candidate, although the surrounding text presents related Riemannian and doubling results; the notation is not reconciled with the preceding notation.
References
Primary source
Christian Ketterer, “Glued spaces and lower curvature bounds”, arXiv:2408.13137 (2026).
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