The growth function of S-recognizable sets

A set $X\subseteq\mathbb N$ is S-recognizable for an abstract numeration system S if the set $\rep_S(X)$ of its representations is accepted by a finite automaton. We show that the growth function of an S-recognizable set is always either $Θ((\log(n))^{c-df}n^f)$ where $c,d\in\mathbb N$ and $f\ge 1$, or $Θ(n^r θ^{Θ(n^q)})$, where $r,q\in\mathbb Q$ with $q\le 1$. If the number of words of length n in the numeration language is bounded by a polynomial, then the growth function of an S-recognizable set is $Θ(n^r)$, where $r\in \mathbb Q$ with $r\ge 1$. Furthermore, for every $r\in \mathbb Q$ with $r\ge 1$, we can provide an abstract numeration system S built on a polynomial language and an S-recognizable set such that the growth function of X is $Θ(n^r)$. For all positive integers k and l, we can also provide an abstract numeration system S built on a exponential language and an S-recognizable set such that the growth function of X is $Θ((\log(n))^k n^l)$.

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