In this paper we present some results on the sequence of coefficients of the chromatic polynomial of a graph relative to the complete graph basis, that is, when it is expressed as the sum of the chromatic polynomials of complete graphs. These coefficients are the coefficients of what is often called
T-chromatic polynomials
โ Scribed by Ian Robertson
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 463 KB
- Volume
- 135
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
โฆ Synopsis
Given a set T of nonnegative integers, a T-coloring of a graph G is a labeling of the vertices of G with positive integers such that no pair of adjacent vertices is labeled with integers differing by a number in T. Let Tc(,l) denote the number of ways to T-color G with numbers from the set (LZ..., A}. We show that there is a polynomial, QG(A), such that Qo(A)= T,(l) provided that 1 is big enough.
๐ SIMILAR VOLUMES
We outline an approach to enumeration problems which relies on the algebra of free abelian groups, giving as our main application a generalisation of the chromatic polynomial of a simple graph G. Our polynomial lies in the free abelian group generated by the poset K(G) of contractions of G, and redu