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- W2058601435 abstract "Abstract A factor f of the Thue–Morse word t in a two-letter alphabet {a, b} is bispecial if fa, fb, af, bf are still factors. We calculate the enumeration function β giving for each integer n > 0 the number β(n) of bispecial factors of length n. We prove that β takes only the values 0 and 2, and that β(n) = 2 iff n = 2k or n = 3.2k, with k ⩾ 0. A simple construction of the bispecial factors from the prefixes of t is given. We consider, moreover, strictly bispecial factors of t, i.e. factors f such that afa, afb, bfa, bfb are still factors of t. We prove that these factors are precisely the bispecial factors of t whose length is n = 2k, k > 0." @default.
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- W2058601435 date "1994-02-01" @default.
- W2058601435 modified "2023-09-27" @default.
- W2058601435 title "On bispecial factors of the Thue–Morse word" @default.
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- W2058601435 doi "https://doi.org/10.1016/0020-0190(94)90008-6" @default.
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