492 search results - page 52 / 99 » combinatorics 2006 |
COMBINATORICS
2006
14 years 9 months ago
2006
This paper introduces parity versions of familiar graph theoretic results, in particular results related to 2-connectedness. The even and odd circuit connected graphs are characte...
COMBINATORICS
2006
14 years 9 months ago
2006
In this paper, we study Grothendieck polynomials indexed by Grassmannian permutations from a combinatorial viewpoint. We introduce the factorial Grothendieck polynomials which are...
COMBINATORICS
2006
14 years 9 months ago
2006
An alternative generalisation of Hayman's concept of admissible functions to functions in several variables is developed and a multivariate asymptotic expansion for the coeff...
COMBINATORICS
2006
14 years 9 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
2006
14 years 9 months ago
2006
We generalize the Ihara-Selberg zeta function to hypergraphs in a natural way. Hashimoto's factorization results for biregular bipartite graphs apply, leading to exact factor...