Papers › Repetitions in infinite palindrome-rich words

Repetitions in infinite palindrome-rich words

22 Apr 2019arXiv:1904.10028links table onlyarchive 2025-07-28

Aseem Raj Baranwal, Jeffrey Shallit

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Rich words are characterized by containing the maximum possible number of distinct palindromes. Several characteristic properties of rich words have been studied; yet the analysis of repetitions in rich words still involves some interesting open problems. We address lower bounds on the repetition threshold of infinite rich words over 2 and 3-letter alphabets, and construct a candidate infinite rich word over the alphabet Σ₂={0,1} with a small critical exponent of 2+√(2)/2. This represents the first progress on an open problem of Vesti from 2017.

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