Projective involution symmetry conjecture for sections

From papers

Let KRnK\subset\mathbb R^n, n3n\geq 3, be a strictly convex body, and let S\mathcal S be a family of hyperplanes that is the image of an embedding of the tangent bundle of the sphere Sn1\mathbb S^{n-1}, with every hyperplane in S\mathcal S intersecting the interior of KK. Projective involution conjecture. If for every XSX\in\mathcal S there is a different YSY\in\mathcal S such that the sections of KK by XX and YY differ by a non-trivial projective involution, then KK and S\mathcal S are both invariant under the same non-trivial projective involution. This is posed as a projective generalization of the corresponding central-projection result and remains open.

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Sources & referencesView supporting material

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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