Geodesic
A counterexample to a question of Hof, Knill and Simon
Sébastien Labbé1
1LIAFA, Université Paris-Diderot-Paris 7
The electronic journal of combinatorics, Tome 21 (2014) no. 3

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Zbl arXiv
In this article, we give a negative answer to a question of Hof, Knill and Simon (1995) concerning purely morphic sequences obtained from primitive morphism containing an infinite number of palindromes. Their conjecture states that such palindromic sequences arise from substitutions that are in class $\mathcal{P}$. The conjecture was proven for the binary alphabet by B. Tan in 2007. We give here a counterexample for a ternary alphabet.
DOI : 10.37236/3758
Classification : 68R15, 37B10, 11B85
Mots-clés : Hof-Knill-Simon conjecture, class P, palindromes, stabilizer

Sébastien Labbé  1

1 LIAFA, Université Paris-Diderot-Paris 7 
Sébastien Labbé. A counterexample to a question of Hof, Knill and Simon. The electronic journal of combinatorics, Tome 21 (2014) no. 3. doi: 10.37236/3758
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     author = {S\'ebastien Labb\'e},
     title = {A counterexample to a question of {Hof,} {Knill} and {Simon}},
     journal = {The electronic journal of combinatorics},
     year = {2014},
     volume = {21},
     number = {3},
     doi = {10.37236/3758},
     zbl = {1299.68045},
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