On The Sum of Digits Function for Number Systems with Negative Bases |
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Authors: | Peter J Grabner Jörg M Thuswaldner |
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Institution: | (1) Institut für Mathematik A, Technische Universität Graz, Steyrergasse 30, 8010 Graz, Austria;(2) Institut für Mathematik und Angewandte Geometrie, Abteilung für Mathematik und Statistik, Montanuniversität Leoben, Franz-Josef-Strasse 18, A-8700 Leoben, Austria |
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Abstract: | Let q 2 be an integer. Then –q gives rise to a number system in
, i.e., each number n
has a unique representation of the form n = c
0 + c
1 (–q) + ... + c
h
(–q)
h
, with c
i
{0,..., q – 1}(0 i h). The aim of this paper is to investigate the sum of digits function –q
(n) of these number systems. In particular, we derive an asymptotic expansion forand obtain a Gaussian asymptotic distribution result for –q
(n) – –q
(–n). Furthermore, we prove non-differentiability of certain continuous functions occurring in this context. We use automata and analytic methods to derive our results. |
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Keywords: | digital expansions sum of digits finite automata non-differentiability |
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