Abstract
The extension of the Motzkin theorem to nonpositively curved spaces gives rise to the use of two different strengths of convexity.
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Grognet, S. Théorème de Motzkin en courbure négative. Geometriae Dedicata 79, 219–227 (2000). https://doi.org/10.1023/A:1005236325541
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DOI: https://doi.org/10.1023/A:1005236325541