Rectangular inscription conjecture for spherical Jordan curves of diameter π

Let S2S^2 be the unit round sphere, and let γ\gamma be a smooth Jordan curve in S2S^2. Its diameter is the supremum of the round distances between points of γ\gamma; assume that this diameter is π\pi. A rectangle of type θ\theta is the inscribed configuration defined in the paper with parameter θ∈(0,π)\theta\in(0,\pi). Spherical rectangular inscription conjecture. The curve γ\gamma inscribes a rectangle of type θ\theta for every θ∈(0,π)\theta\in(0,\pi). This extends the preceding theorem beyond curves disjoint from their antipodals, and would establish rectangular inscriptions for smooth spherical Jordan curves whose diameter is π\pi; the proposed approaches involve Hamiltonian motion and Floer-homological ideas.

References

Primary source

Ali Naseri Sadr, “Inscriptions in non-Euclidean Geometries”, arXiv:2507.07945 (2025).

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