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.

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Primary source

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

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