Nöbeling-space model conjecture for ending lamination spaces

Let SS be a pp-punctured surface of genus gg, and set n=3g+p4n=3g+p-4. Define kk by k=0k=0 if g=0g=0, k=g1k=g-1 if both p0p\neq 0 and g0g\neq 0, and k=g2k=g-2 if p=0p=0. Let Rn+k2n+1\mathbb{R}^{2n+1}_{n+k} denote the space of points in R2n+1\mathbb{R}^{2n+1} with at most n+kn+k rational coordinates. Nöbeling-space model conjecture. The ending lamination space EL(S)\mathcal{E} \mathcal{L} (S) is homeomorphic to Rn+k2n+1\mathbb{R}^{2n+1}_{n+k}. This speculative conjecture extends the known genus-zero cases and predicts the precise Nöbeling parameter from the topology of SS; the source provides no proof in the general case.

Sources & referencesView supporting material

Primary source

David Gabai, “On the topology of ending lamination space”, arXiv:1105.3648 (2011).

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