Projective involution symmetry conjecture for sections
Projective involution symmetry conjecture for sections
Let , , be a strictly convex body, and let be a family of hyperplanes that is the image of an embedding of the tangent bundle of the sphere , with every hyperplane in intersecting the interior of . Projective involution conjecture. If for every there is a different such that the sections of by and differ by a non-trivial projective involution, then and 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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