A common generalization of some identities.
Zhang, Zhizheng, Wang, Jun (2005)
Integers
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Zhang, Zhizheng, Wang, Jun (2005)
Integers
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Journal of Integer Sequences [electronic only]
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Sun, Zhiwei (2002)
Integers
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Isgur, Abraham, Rahman, Mustazee (2011)
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Duffus, Dwight, Sands, Bill (2005)
The Electronic Journal of Combinatorics [electronic only]
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Tripathi, Amitabha (2006)
Integers
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Uchida, Yasuharu (2008)
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Ligia Cristea, Helmut Prodinger (2013)
Open Mathematics
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We investigate the visibility parameter, i.e., the number of visible pairs, first for words over a finite alphabet, then for permutations of the finite set {1, 2, …, n}, and finally for words over an infinite alphabet whose letters occur with geometric probabilities. The results obtained for permutations correct the formula for the expectation obtained in a recent paper by Gutin et al. [Gutin G., Mansour T., Severini S., A characterization of horizontal visibility graphs and combinatorics...