Corrigendum: On multiperiodic words

Štěpán Holub

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Efficient validation and construction of border arrays and validation of string matching automata

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RAIRO - Theoretical Informatics and Applications

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We present an on-line linear time and space algorithm to check if an integer array is the border array of at least one string built on a bounded or unbounded size alphabet . First of all, we show a bijection between the border array of a string and the skeleton of the DFA recognizing Σ*ω, called a string matching automaton (SMA). Different strings can have the same border array but the originality of the presented method is that the correspondence between a border array...

Finite repetition threshold for large alphabets

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RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications

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We investigate the finite repetition threshold for -letter alphabets, ≥ 4, that is the smallest number for which there exists an infinite -free word containing a finite number of -powers. We show that there exists an infinite Dejean word on a 4-letter alphabet (a word without factors of exponent more than 7/5 ) containing only two 7/5 -powers. For a 5-letter alphabet, we show that there exists an infinite Dejean word containing only 60 5/4 -powers, and we conjecture...