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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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Background

The authors previously conjectured that the Rhombicosidodecahedron fails to have Rupert’s property, but their current techniques do not resolve this case. They indicate that certain local configurations prevent a straightforward application of their local theorem, leaving the conjecture unproven.

Confirming the conjecture would extend the negative results beyond the Noperthedron, clarifying the boundary of Rupert’s property among well-known highly symmetric polyhedra.

References

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