86 search results - page 4 / 18 » Combinatorics of generalized q-Euler numbers |
COMBINATORICS
2006
13 years 7 months ago
2006
Previous work has shown the perhaps surprising result that, for any binary phylogenetic tree T , there is a set of four characters that define T . Here we deal with the general ca...
COMBINATORICS
2007
13 years 7 months ago
2007
We investigate the notion of quantum chromatic number of a graph, which is the minimal number of colours necessary in a protocol in which two separated provers can convince a refe...
CORR
2004
Springer
13 years 7 months ago
2004
Springer
This article is not a research paper, but a little note on the history of combinatorics: we present here a tentative short biography of Henri Delannoy, and a survey of his most no...
COMBINATORICS
2000
13 years 7 months ago
2000
A (multi)hypergraph H with vertices in N contains a permutation p = a1a2 . . . ak of 1, 2, . . . , k if one can reduce H by omitting vertices from the edges so that the resulting ...
COMBINATORICS
1998
13 years 7 months ago
1998
We show that the moments of the trace of a random unitary matrix have combinatorial interpretations in terms of longest increasing subsequences of permutations. To be precise, we s...