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A dimension gap for continued fractions with independent digits

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Abstract

Kinney and Pitcher (1966) determined the dimension of measures on [0, 1] which make the digits in the continued fraction expansion i.i.d. variables. From their formula it is not clear that these dimensions are less than 1, but this follows from the thermodynamic formalism for the Gauss map developed by Walters (1978). We prove that, in fact, these dimensions are bounded by 1−10−7. More generally, we considerf-expansions with a corresponding absolutely continuous measureμ under which the digits form a stationary process. Denote byE δ the set of reals where the asymptotic frequency of some digit in thef-expansion differs by at leastδ from the frequency prescribed byμ. ThenE δ has Hausdorff dimension less than 1 for anyδ>0.

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Authors and Affiliations

  1. Institute of Mathematics, The Hebrew University of Jerusalem Givat Ram, 91904, Jerusalem, Israel

    Yuri Kifer, Yuval Peres & Benjamin Weiss

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  1. Yuri Kifer
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  2. Yuval Peres
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  3. Benjamin Weiss
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Correspondence to Yuri Kifer.

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Kifer, Y., Peres, Y. & Weiss, B. A dimension gap for continued fractions with independent digits. Isr. J. Math. 124, 61–76 (2001). https://doi.org/10.1007/BF02772607

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