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Automaticity IV : sequences, sets, and diversity

Jeffrey Shallit — 1996

Journal de théorie des nombres de Bordeaux

This paper studies the descriptional complexity of (i) sequences over a finite alphabet ; and (ii) subsets of N (the natural numbers). If ( s ( i ) ) i 0 is a sequence over a finite alphabet Δ , then we define the k - of s , A s k ( n ) , to be the smallest possible number of states in any deterministic finite automaton that, for all i with 0 i n , takes i expressed in base k as input and computes s ( i ) . We give examples of sequences that have high automaticity in all bases k ; for example, we show that the characteristic sequence of...

Kolam indiens, dessins sur le sable aux îles Vanuatu, courbe de Sierpinski et morphismes de monoïde

Gabrielle AlloucheJean-Paul AlloucheJeffrey Shallit — 2006

Annales de l’institut Fourier

Nous montrons que le tracé d’un kolam indien classique, que l’on retrouve aussi dans la tradition des dessins sur le sable aux îles Vanuatu, peut être engendré par un morphisme de monoïde. La suite infinie morphique ainsi obtenue est reliée à la célèbre suite de Prouhet-Thue-Morse, mais elle n’est k -automatique pour aucun entier k 1 .

Squares and overlaps in the Thue-Morse sequence and some variants

Shandy BrownNarad RampersadJeffrey ShallitTroy Vasiga — 2006

RAIRO - Theoretical Informatics and Applications

We consider the position and number of occurrences of squares in the Thue-Morse sequence, and show that the corresponding sequences are -regular. We also prove that changing any finite but nonzero number of bits in the Thue-Morse sequence creates an overlap, and any linear subsequence of the Thue-Morse sequence (except those corresponding to decimation by a power of ) contains an overlap.

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