University of Haifa

output

19922026

most citedThe new world atlas of artificial night sky brightness

1.7k citations

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions

Showing 2006 · math.COShow all

4 papers · 2 filters

math.CO2006

Restricted Motzkin permutations, Motzkin paths, continued fractions, and Chebyshev polynomials

Sergi Elizalde, Toufik Mansour

We say that a permutation $π$ is a Motzkin permutation if it avoids 132 and there do not exist $a < b$ such that $π_{a} < π_{b} < π_{b + 1}$ . We study the distribution of several statistics in…

math.CO2006

Restricted Dumont permutations, Dyck paths, and noncrossing partitions

Alexander Burstein, Sergi Elizalde, Toufik Mansour

We complete the enumeration of Dumont permutations of the second kind avoiding a pattern of length 4 which is itself a Dumont permutation of the second kind. We also consider some…

math.CO2006

Wilf classification of three and four letter signed patterns

W. M. B. Dukes, T. Mansour, A. Reifegerste

We give some new Wilf equivalences for signed patterns which allow the complete classification of signed patterns of lengths three and four. The problem is considered for pattern a…

math.CO2006★ 1 cited

Sums and differences along Hamiltonian cycles

Vsevolod F. Lev

Given a finite abelian group $G$ , consider the complete graph on the set of all elements of $G$ . Find a Hamiltonian cycle in this graph and for each pair of consecutive vertices al…