## Abstract We represent a graph by assigning each vertex a finite set such that vertices are adjacent if and only if the corresponding sets have at least two common elements. The __2βintersection number__ ΞΈ~2~(__G__) of a graph __G__ is the minimum size of the union of sets in such a representatio
Trees with the same degree sequence and path numbers
β Scribed by Gary Gordon; Eleanor McDonnell
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 172 KB
- Volume
- 147
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
β¦ Synopsis
We give an elementary procedure based on simple generating functions for constructing n (for any n >/2) pairwise non-isomorphic trees, all of which have the same degree sequence and the same number of paths of length k for all k >t 1. The construction can also be used to give a sufficient condition for isomorphism of caterpillars.
π SIMILAR VOLUMES
An ordered tree with specified degree sequence and n internal nodes has a i Ε½ . nodes of degree i, where a s 1 q Γ i y 1 a and n s Γ a . This paper presents the first loopless algorithm for generating all ordered trees with specified degree sequence. It uses a new version of the algorithm for gener
## Abstract The number of independent vertex subsets is a graph parameter that is, apart from its purely mathematical importance, of interest in mathematical chemistry. In particular, the problem of maximizing or minimizing the number of independent vertex subsets within a given class of graphs has
## Abstract Suppose __G__ is a connected graph and __T__ a spanning tree of __G__. A vertex __v__ Ξ΅ __V__(__G__) is said to be a degreeβpreserving vertex if its degree in __T__ is the same as its degree in __G__. The degreeβpreserving spanning tree problem is to find a spanning tree __T__ of a conn