Counting ordered patterns in words generated by morphisms

Kitaev, Sergey and Mansour, Toufik and Seebold, Patrice (2008) Counting ordered patterns in words generated by morphisms. Integers: Electronic Journal of Combinatorial Number Theory, 8 (1). ISSN 1553-1732

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Abstract

We start a general study of counting the number of occurrences of ordered patterns in words generated by morphisms. We consider certain patterns with gaps (classical patterns) and those with no gaps (consecutive patterns). Occurrences of the patterns are known, in the literature, as rises, descents, (non-)inversions, squares and p-repetitions. We give recurrence formulas in the general case, then deducing exact formulas for particular families of morphisms. Many (classical or new) examples are given illustrating the techniques and showing their interest.