The straightbrush model conjecture for the residual compact set

Let KaddrK_{\mathrm{addr}} be the addresses odometer, identified with the Cantor set of connected components of KK_\infty. A subset BKaddr×[0,1]B\subset K_{\mathrm{addr}}\times[0,1] is required to encode each component as a vertical initial segment. Straightbrush model conjecture. There exists a closed subset BB of Kaddr×[0,1]K_{\mathrm{addr}} \times [0,1] homeomorphic to KK_\infty which satisfies

  1. Kaddr×{0}BK_{\mathrm{addr}}\times\{0\}\subset B;
  2. For all αKaddr\alpha\in K_{\mathrm{addr}} there exists eα[0,1]e_\alpha\in[0,1] such that (α,t)B(\alpha,t)\in B if and only if 0teα0\leq t\leq e_\alpha (such eαe_\alpha is called an upper endpoint);
  3. The set of upper endpoints is dense in BB.

This conjectures a topological model of KK_\infty analogous to a straightbrush or hairy arc. The source establishes a dense countable family of components homeomorphic to a common line segment, but leaves the global homeomorphism to this model open.

Sources & referencesView supporting material

Primary source

Alexandre Dezotti and Pascale Roesch, “On (non-)local-connectivity of some Julia sets”, arXiv:1203.2741 (2012).

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