Refinement of Bezdek's conjecture for Larman points

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Let K⊂RnK\subset \mathbb{R}^{n} be a convex body with n≥3n\geq 3, and let p∈∫⁡Kp\in\operatorname*{\int}K. For every hyperplane Π\Pi passing through pp, suppose the section Π∩K\Pi\cap K has an (n−2)(n-2)-plane of symmetry; then pp is a Larman point of KK. If, moreover, every such section has an (n−2)(n-2)-plane of symmetry containing pp, then pp is a revolution point of KK. Refinement of Bezdek's conjecture. Suppose that pp is a Larman point of KK which is not a revolution point of KK. Then either KK is an ellipsoid or KK is a body of revolution. This refinement concerns the global shape forced by the distinction between Larman and revolution points; the supplied source gives no resolution status.

References

Primary source

Efrén Morales-Amaya, “Convex bodies with sections with hyperplanes of symmetry”, arXiv:2509.17326 (2025).

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