The Neoplatonic homotopy conjecture

From papers

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<l0<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<l0<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 l0l\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.

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Sources & referencesView supporting material

Primary source

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

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