Mansour, Toufik - Enumeration of words by the sum of differences between adjacent letters

dmtcs:467 - Discrete Mathematics & Theoretical Computer Science, January 1, 2009, Vol. 11 no. 1
Enumeration of words by the sum of differences between adjacent letters

Authors: Mansour, Toufik

We consider the sum u of differences between adjacent letters of a word of n letters, chosen uniformly at random from a given alphabet. This paper obtains the enumerating generating function for the number of such words with respect to the sum u, as well as explicit formulas for the mean and variance of u.


Source : oai:HAL:hal-00988177v1
Volume: Vol. 11 no. 1
Section: Combinatorics
Published on: January 1, 2009
Submitted on: March 26, 2015
Keywords: [INFO.INFO-DM] Computer Science [cs]/Discrete Mathematics [cs.DM]


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