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math.CO2019
Disposability in Square-Free Words
Tero Harju
We consider words over the alphabet . It is shown that there are irreducibly square-free words of all lengths except 4,5,7 and 12. Such a word is square-free (…
math.CO2019
Some further results on squarefree arithmetic progressions in infinite words
James Currie, Tero Harju, Pascal Ochem +1
In a recent paper, one of us posed three open problems concerning squarefree arithmetic progressions in infinite words. In this note we solve these problems and prove some addition…