Abstract
We show that a compact length space is polyhedral if a small spherical neighborhood of any point is conic.
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Notes
It also follows that \(V_i\) forms a strongly convex subset of \(X\); i.e., any minimizing geodesic in \(X\) with ends in \(V_i\) lies completely in \(V_i\). This property is not needed in our proof, but it is used in the alternative proof; see the last section.
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Acknowledgments
We would like to thank Arseniy Akopyan, Vitali Kapovitch, Alexander Lytchak and Dmitri Panov for their help.
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N. Lebedeva was partially supported by RFBR Grant 14-01-00062. A. Petrunin was partially supported by NSF Grant DMS 1309340.
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Lebedeva, N., Petrunin, A. Local characterization of polyhedral spaces. Geom Dedicata 179, 161–168 (2015). https://doi.org/10.1007/s10711-015-0072-x
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DOI: https://doi.org/10.1007/s10711-015-0072-x