Larman-point conjecture for convex bodies

Let KRnK\subset \mathbb{R}^{n}, n3n\geq 3, be a convex body. A point pRnp\in\mathbb{R}^{n} is a Larman point of KK if, for every hyperplane Π\Pi passing through pp, the section ΠK\Pi\cap K has an (n2)(n-2)-plane of symmetry. A Larman point is a revolution point if every such section has an (n2)(n-2)-plane of symmetry containing pp. Larman-point conjecture. If pp is a Larman point of KK that is not a revolution point of KK, then either KK is an ellipsoid or KK is a body of revolution. The conjecture seeks to characterize convex bodies from the symmetry of hyperplane sections through one point; the source focuses on this question with additional hypotheses and does not report a resolution.

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Primary source

María Angeles Alfonseca, Michelle Cordier, Jesús Jerónimo-Castro and Efrén Morales-Amaya, “A Characterization of the sphere and a body of revolution by means of Larman points”, arXiv:2307.09585 (2025).

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