The distribution of ascents of size d or more in compositions

Charlotte Brennan (1) , Arnold Knopfmacher (2)

1 School of Mathematics [Johannesburg]
2 The John Knopfmacher Centre for Applicable Analysis and Number Theory [Johannesburg]

A composition of a positive integer n is a finite sequence of positive integers a(1), a(2), ..., a(k) such that a(1) + a(2) + ... + a(k) = n. Let d be a fixed nonnegative integer. We say that we have an ascent of size d or more if a(i+1) >= a(i) + d. We determine the mean, variance and limiting distribution of the number of ascents of size d or more in the set of compositions of n. We also study the average size of the greatest ascent over all compositions of n.

Domaines: Mathématique discrète [cs.DM]

Charlotte Brennan, Arnold Knopfmacher. The distribution of ascents of size d or more in compositions. Discrete Mathematics and Theoretical Computer Science, 2009, Vol. 11 no. 1 (1), pp.1--10. ⟨10.46298/dmtcs.462⟩. ⟨hal-00988184⟩