 |
 |
 |
 |
 |
 |
 |
 |
 Infinite Sets of Square-Free omega-words Derived from the Prouhet-Thue-Morse Sequence
 |
 |
 |
 |
 |
 |

Organization: | University of California, Santa Cruz |
Organization: | Rovaniemi Polytechnic |
Department: | School of Technology |
Organization: | Carnegie Mellon University |
Department: | School of Computer Science |
 |
 |
 |
 |
 |
 |
 2004 International Mathematica Symposium
 |
 |
 |
 |
 |
 |
 Banff, Canada
 |
 |
 |
 |
 |
 |
 We describe a method to generate an infinite set of unique square-free omega-words from the (Prouhet)-Thue-Morse sequence on a four letter alphabet. This result is a generalization of the method introduced by Axel Thue in 1912 for constructing a square-free omega-word over four (and then over three) letters from the Thue-Morse sequence. The new method has been further generalized to produce infinite sets of square-free omega-words on larger alphabets. We present a method for constructing a new square-free omega-word over three letters from an element of the infinite set of square-free omega-words over six letters that results from the generalization described above.
 |
 |
 |
 |
 |
 |

 |
 |
 |
 |
 |
 |
 Prouhet-Thue-Morse Sequence, Thue-Morse sequence, omega-words
 |
 |
 |
 |
 |
 |

 |
 |