Rhombicosidodecahedron non-Rupert conjecture
Prove that the Rhombicosidodecahedron (RID) does not have Rupert’s property. Establishing this would resolve a standing conjecture about the Rupert status of the RID.
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In Conjecture 2 we conjectured that the Rhombicosidodecahedron (RID in short) does not have Rupert's property. We still believe this conjecture, however the methods of this paper do not suffice to prove it.
— A convex polyhedron without Rupert's property
(2508.18475 - Steininger et al., 25 Aug 2025) in Section 9: Discussion, Origin of the Noperthedron