Some properties of B\"uchi Arithmetics

Abstract

B\"uchi arithmetics $\mathop{\mathbf{BA}}\nolimits_n$, $n\ge 2$, are extensions of Presburger arithmetic with an unary functional symbol $V_n(x)$ denoting the largest power of $n$ that divides $x$. A rank of a linear order is the minimal number of condensations required to reach a finite order. We show that linear orders of arbitrarily large finite rank can be interpreted in $\mathop{\mathbf{BA}}\nolimits_n$. We also prove that the extension of the axioms of Presburger arithmetic with the inductive definition of $V_n$ does not yield an axiomatization of $\mathop{\mathbf{BA}}\nolimits_n$.