Central symmetry from inversely homothetic sections

Let K,SRnK,S\subset\mathbb R^n, n3n\geq 3, be convex bodies with SintKS\subset\operatorname{int}K. Inversely homothetic sections conjecture. If, for every pair of parallel hyperplanes H1,H2H_1,H_2 supporting SS, the sections KH1K\cap H_1 and KH2K\cap H_2 are inversely homothetic with respect to the point lying on the segment connecting the contact points of KK with H1H_1 and H2H_2, then KK and SS are centrally symmetric with respect to the same point. The statement is presented as a parallel-section counterpart of the projective involution conjecture and remains open.

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Primary source

Bartłomiej Zawalski, “On flat shadow boundaries from point light sources and the characterization of ellipsoids”, arXiv:2603.29130 (2026).

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