Nyldon Factorization of Thue-Morse Words and Fibonacci Words
Kaisei Kishi, Kazuki Kai, Yuto Nakashima, Shunsuke Inenaga, Hideo Bannai
公開日: 2025/7/31
Abstract
The Nyldon factorization is a string factorization that is a non-decreasing product of Nyldon words. Nyldon words and Nyldon factorizations are recently defined combinatorial objects inspired by the well-known Lyndon words and Lyndon factorizations. In this paper, we investigate the Nyldon factorization of several words. First, we fully characterize the Nyldon factorizations of the (finite) Fibonacci and the (finite) Thue-Morse words. Moreover, we show that there exists a non-decreasing product of Nyldon words that is a factorization of the infinite Thue-Morse word.