On identity transformations in commutative semigroups. (English) Zbl 1168.20313
Discrete Math. Appl. 17, No. 6, 629-640 (2007); translation from Diskretn. Mat. 19, No. 4, 139-149 (2007).
Summary: It is proved that in any commutative semigroup the complexity of transformations of equal terms of length at most \(n\) into each other is of order \(n\log n\).
References:
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| [2] | Lyndon R. C., Trans. Amer. Math. Soc. 71 pp 457– (1951) |
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