The soul conjecture for open Alexandrov spaces

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Let X∈Alex⁡n(0)X\in \operatorname{Alex}^n(0) be an open Alexandrov space, let SS be a compact totally convex soul without boundary, and let ϕ:X→S\phi:X\to S be the Sharafutdinov projection.

Soul conjecture. If XX contains an open subset where the curvature is bounded below by a positive constant, then SS is a point.

This is a conjectured Alexandrov-geometric counterpart of the Riemannian soul theorem. The source notes that the submetry conjecture implies this conjecture, but gives no resolution.

References

Primary source

Xueping Li and Xiaochun Rong, “Open Alexandrov spaces of nonnegative curvature”, arXiv:2311.15174 (2025).

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