Expansions in non-integer bases: lower, middle and top orders

Details Expansions in non-integer bases: lower, middle and top orders Expansions in non-integer bases: lower, middle and top orders

2006-08-10

arxiv.org/abs/math/0608263v4

Mathematics

Number Theory

15 pages; to appear in J. Number Theory

Scientific paper

10.1016/j.jnt.2008.11.003

Let $q\in(1,2)$; it is known that each $x\in[0,1/(q-1)]$ has an expansion of the form $x=\sum_{n=1}^\infty a_nq^{-n}$ with $a_n\in\{0,1\}$. It was shown in \cite{EJK} that if $q<(\sqrt5+1)/2$, then each $x\in(0,1/(q-1))$ has a continuum of such expansions; however, if $q>(\sqrt5+1)/2$, then there exist infinitely many $x$ having a unique expansion \cite{GS}. In the present paper we begin the study of parameters $q$ for which there exists $x$ having a fixed finite number $m>1$ of expansions in base $q$. In particular, we show that if $q1$ there exists $\ga_m>0$ such that for any $q\in(2-\ga_m,2)$, there exists $x$ which has exactly $m$ expansions in base $q$.

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