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- W2911862502 abstract "The avoidability, or unavoidability of patterns in words over finite alphabets has been studied extensively. A word (pattern) over a finite set is said to be unavoidable if, for all but finitely many words, there exists a morphism mapping the pattern into every word. We present various complexity-related properties of unavoidable words. For words that are unavoidable, we provide an upper bound to the lengths of words that avoid them. A natural subsequent question is how many unavoidable words there are. We show that the fraction of words that are unavoidable drops exponentially fast in the length of the word. This allows us to calculate an upper bound on the number of unavoidable patterns for any given finite alphabet. Subsequently, we investigate computational aspects of unavoidable words. In particular, we exhibit concrete algorithms for determining whether a word is unavoidable. We also prove results on the computational complexity of the problem of determining whether a given word is unavoidable." @default.
- W2911862502 created "2019-02-21" @default.
- W2911862502 creator A5015376602 @default.
- W2911862502 date "2019-01-14" @default.
- W2911862502 modified "2023-09-25" @default.
- W2911862502 title "The complexity of unavoidable word patterns" @default.
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