Conjecture I on tameness of infinitely punctured planes

Let P\mathscr{P} denote the class of closed discrete subsets of C\mathbb{C}, and let APA\in\mathscr{P}. An automorphism hAut(CA)h\in\operatorname{Aut}(\mathbb{C}\setminus A) has infinite order if no positive power of hh is the identity. The quotient (CA)/h\left(\mathbb{C}\setminus A\right)/\langle h\rangle is formed by the cyclic group generated by hh.

Conjecture I. If there exists an automorphism of infinite order hAut(CA)h\in\operatorname{Aut}(\mathbb{C}\setminus A) such that the quotient space (CA)/h\left(\mathbb{C}\setminus A\right)/\langle h\rangle has infinitely many punctures, then AA is not tame.

The conjecture is motivated by the preceding theorem, which shows that tameness would force arbitrarily many points of AA to occur in every prescribed small disk under the same quotient hypothesis. The source provides no resolution, so the conjecture remains open.

Sources & referencesView supporting material

Primary source

H. Fujino, “On quasiconformal equivalence between certain infinitely often punctured planes”, arXiv:1405.0340 (2014).

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