Conical limit sets and continued fractions

Short, Dr. Ian and Crane, Dr. Edward (2007) Conical limit sets and continued fractions. [Preprint]

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Inspired by questions of convergence in continued fraction theory, Erdos, Piranian and Thron studied the possible sets of divergence for arbitrary sequences of Moebius maps acting on the Riemann sphere, S^2. By identifying S^2 with the boundary of three-dimensional hyperbolic space, H^3, we show that these sets of divergence are precisely the sets that arise as conical limit sets of subsets of H^3. Using hyperbolic geometry, we give simple geometric proofs of the theorems of Erdos, Piranian and Thron that generalise to arbitrary dimensions. New results are also obtained about the class of conical limit sets, for example, that it is closed under locally quasisymmetric homeomorphisms. Applications are given to continued fractions.

Item Type: Preprint
Keywords: Conical limit set, continued fraction, hyperbolic geometry, quasiconformal mapping, Diophantine approximation
Academic Unit: Faculty of Science and Engineering > Mathematics and Statistics
Item ID: 721
Depositing User: Ian Short
Date Deposited: 29 Nov 2007
Refereed: Yes

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