The Neoplatonic homotopy conjecture

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A 6-net is a simplicial triangulation of the 22-sphere with maximum degree at most 66. For a 66-net σ\sigma and 0<l≤∞0<l\leq\infty, let Δ(σ,l)\Delta(\sigma,l) denote a realization at side length ll. An undented hyperbolic polyhedron is a hyperbolic polyhedron without dents; Δ(σ,∞)\Delta(\sigma,\infty) is the ideal endpoint, and Δ(σ)\Delta(\sigma) is the Euclidean neoplatonic realization.

Neoplatonic homotopy conjecture. Every 66-net σ\sigma has a family of realizations Δ(σ,l)\Delta(\sigma,l), each unique up to isometry, as undented hyperbolic polyhedra of side length ll, 0<l≤∞0<l\leq\infty, where Δ(σ,∞)\Delta(\sigma,\infty) is an equilateral ideal hyperbolic polyhedron. After rescaling all lengths by 1/l1/l, Δ(σ,l)\Delta(\sigma,l) converges as l→0l\rightarrow0 to the Euclidean neoplatonic realization Δ(σ)\Delta(\sigma).

The conjecture describes a continuous deformation from the ideal hyperbolic realization to the Euclidean one while preserving undentedness. The source gives animations illustrating this deformation but does not prove the asserted family or convergence.

References

Primary source

Peter Doyle and Matthew Ellison, “Neoplatonic solids”, arXiv:2607.26363 (2026).

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