q-Enumeration of words by their total variation

Ligia Loreta Cristea 1 Helmut Prodinger 2
1 Institut fur Mathematik
2 DMS - Department of Mathematical Sciences [Matieland, Stellenbosch Uni.]
Abstract : In recent work, Mansour [Discrete Math. Theoret. Computer Science 11, 2009, 173--186] considers the problem of enumerating all words of length n over {1,2,...,k} (where k is a given integer), that have the total variation equal to a given integer m. In the present paper we study various types of random words over the infinite alphabet ℕ, where the letters have geometric probabilities. We are interested in the probabilities of words of given type to have a given total variation.
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Discrete Mathematics and Theoretical Computer Science, DMTCS, 2011, special issue in honor of Laci Babai's 60th birthday: Combinatorics, Groups, Algorithms, and Complexity, 12 (3), pp.139-150
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Ligia Loreta Cristea, Helmut Prodinger. q-Enumeration of words by their total variation. Discrete Mathematics and Theoretical Computer Science, DMTCS, 2011, special issue in honor of Laci Babai's 60th birthday: Combinatorics, Groups, Algorithms, and Complexity, 12 (3), pp.139-150. 〈hal-00993529〉

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