Growth rate of binary words avoiding xxx

Autor: James D. Currie, Narad Rampersad
Rok vydání: 2016
Předmět:
Zdroj: Theoretical Computer Science. 609:456-468
ISSN: 0304-3975
DOI: 10.1016/j.tcs.2015.11.004
Popis: Consider the set of those binary words with no non-empty factors of the form x x x R . Du, Mousavi, Schaeffer, and Shallit asked whether this set of words grows polynomially or exponentially with length. In this paper, we demonstrate the existence of upper and lower bounds of the form n lg ? n + o ( lg ? n ) on the number of such words of length n, where lg ? n denotes the base-2 logarithm of n.
Databáze: OpenAIRE