The centroid-section conjecture for pairs of convex bodies

Let K1,K2RnK_1,K_2\subset\mathbb R^n, n2n\geq 2, be different convex bodies. For every affine hyperplane HGraffn1(Rn)H\in\operatorname{Graff}_{n-1}(\mathbb R^n) that intersects both bodies, consider the centroids of K1HK_1\cap H and K2HK_2\cap H. Centroid-section conjecture. If these centroids coincide for every such HH, then K1K_1 and K2K_2 are concentric, homothetic ellipsoids. The conjecture was recently proved by F. Nazarov, D. Ryabogin, V. Yaskin, and B. Zawalski for centrally symmetric convex bodies with boundary of class C1C^1; the unrestricted statement remains unresolved.

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Primary source

M. Angeles Alfonseca and B. Zawalski, “On Bezdek's conjecture for high-dimensional convex bodies with an aligned center of symmetry”, arXiv:2501.06337 (2026).

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