On two conjectures of Shallit about Thue-Morse-like sequences

Abstract

We study a class of infinite words $x_k$ , where $k$ is a positive integer, recently introduced by J. Shallit. This class includes the Thue-Morse sequence $x_1$, the Fibonacci-Thue-Morse sequence $x_2$, and the Allouche-Johnson sequence $x_3$. Shallit stated and for $k=3$ proved two conjectures on properties of $x_k$. The first conjecture concerns the factor complexity, the second one the critical exponent of these words. We confirm the validity of both conjectures for every $k$.

arXiv comment25 pages, 1 figure. Amended with reviewer comments. Accepted for publication in the European Journal of Combinatorics

References in corpus (2)

• Bispecial factors in circular non-pushy D0L languages
• On balanced sequences and their critical exponent