Abstract
In 1975 Walter Philipp proved the law of the iterated logarithm (LIL) for the discrepancy of lacunary sequences: for any sequence \((n_k)_{k \ge 1}\) satisfying the Hadamard gap condition \(n_{k+1} / n_k \ge q > 1,~k \ge 1,\) we have
for almost all \(x\). In recent years there has been significant progress concerning the precise value of the limsup in this LIL for special sequences \((n_k)_{k \ge 1}\) having a “simple” number-theoretic structure. However, since the publication of Philipp’s paper there has been no progress concerning the lower bound in this LIL for generic lacunary sequences \((n_k)_{k \ge 1}\). The purpose of the present paper is to collect known results concerning this problem, to investigate what the optimal value in the lower bound could be, and for which special sequences \((n_k)_{k \ge 1}\) a small value of the limsup in this LIL can be obtained. We formulate three open problems, which could serve as the main targets for future research.
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Communicated by K. Gröchenig.
C. Aistleitner is supported by a Schrödinger scholarship of the Austrian Research Foundation (FWF). K. Fukuyama is supported by KAKENHI 24340017 and 24340020.
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Aistleitner, C., Fukuyama, K. Extremal discrepancy behavior of lacunary sequences. Monatsh Math 177, 167–184 (2015). https://doi.org/10.1007/s00605-014-0693-4
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DOI: https://doi.org/10.1007/s00605-014-0693-4
Keywords
- Discrepancy theory
- Uniform distribution modulo 1
- Lacunary sequences
- Metric number theory
- Law of the iterated logarithm