The digit-determining conjecture for non-strongly recurrent quadratic laminations

Let αT\alpha\in\mathbb{T} be a parameter, and let GCSn(α)GCS_n(\alpha) denote the generalized cylinder set associated with the first n+1n+1 letters of the itinerary I(α)I(\alpha). Say that α\alpha is strongly recurrent according to the preceding definition, and call it pre-periodic when its associated itinerary is pre-periodic. Digit-determining conjecture. If α\alpha is not strongly recurrent and is not pre-periodic, then the statement of Proposition~ still holds: for every integer L>0L>0, there exists an integer Lα>0L_\alpha>0 such that

GCSn(α){hi(α)}i=1L=for all nLα.GCS_n(\alpha)\cap\{h^i(\alpha)\}_{i=1}^L=\emptyset\quad\text{for all }n\geq L_\alpha.

The conjecture removes the non-weakly-pre-periodic hypothesis from Proposition~. If true, the paper notes that all points on T\mathbb{T} except for a set of Hausdorff dimension zero would satisfy CCECCE; the claim remains open in the supplied text.

Sources & referencesView supporting material

Primary source

Linhang Huang, “Collet-Eckmann type conditions and conformal welding of unicritical quadratic laminations”, arXiv:2505.02965 (2025).

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