Publication details

Binary patterns in the Prouhet-Thue-Morse sequence

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Year of publication 2021
Type Article in Periodical
Magazine / Source Discrete Mathematics and Theoretical Computer Science
MU Faculty or unit

Faculty of Science

Keywords Prouhet-Thue-Morse sequence; pattern; infinite word; special word
Description We show that, with the exception of the words a(2)ba(2) and b(2)ab(2), all (finite or infinite) binary patterns in the Prouhet-Thue-Morse sequence can actually be found in that sequence as segments (up to exchange of letters in the infinite case). This result was previously attributed to unpublished work by D. Guaiana and may also be derived from publications of A. Shur only available in Russian. We also identify the (finitely many) finite binary patterns that appear non trivially, in the sense that they are obtained by applying an endomorphism that does not map the set of all segments of the sequence into itself.
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