Hausdorff dimension of the set of singular pairs

Details Hausdorff dimension of the set of singular pairs Hausdorff dimension of the set of singular pairs

2007-09-28

arxiv.org/abs/0709.4534v2

Mathematics

Dynamical Systems

40 pages, revised proofs, added explanations

Scientific paper

In this paper we show that the Hausdorff dimension of the set of singular pairs is 4/3. We also show that the action of diag(e^t,e^t,e^{-2t}) on SL(3,R)/SL(3,Z) admits divergent trajectories that exit to infinity at arbitrarily slow prescribed rates, answering a question of A.N. Starkov. As a by-product of the analysis, we obtain a higher dimensional generalisation of the basic inequalities satisfied by convergents of continued fractions. As an illustration of the techniques used to compute Hausdorff dimension, we show that the set of real numbers with divergent partial quotients has Hausdorff dimension 1/2.

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