A blabelling of graph G is an integer labelling of V(G) such that adjacent vertices have labels that differ by at least two and vertices distance two apart have labels that differ by at least one. The 1 number of G, I(G), is the minimum span of labels over all such labellings. Griggs and Yeh have st
Path-sequential labellings of cycles
โ Scribed by Jeffrey M. Vanderkam
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 508 KB
- Volume
- 162
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
โฆ Synopsis
We investigate labelling the vertices of the cycle of length n with the integers 0, ..., n -1 in such a way that the n sums of k adjacent integers are sequential. We show that this is impossible for both n and k even, possible for n even and k odd, and that it is possible for many cases where n is odd. We conjecture that it is always possible when n is odd.
๐ SIMILAR VOLUMES
IS called a prime labelling if for each e = {u, u} in E, we have GCD(f(u),f(u))= 1. A graph admits a prime labelling is called a prime graph. Around ten years ago, Roger Entringer conjectured that every tree is prime. So far, this conjecture is still unsolved. In this paper, we show that the conject
A valuation on a simple graph G IS an assignment of labels to the vertices of G which induces an assignment of labels to the edges of G. pvaluations, also called graceful labelings, and a-valuations, a subclass of graceful labelings, have an extensive literature; harmonious labelings have been intro
## Abstract Every labeling of the vertices of a graph with distinct natural numbers induces a natural labeling of its edges: the label of an edge (__x, y__) is the absolute value of the difference of the labels of __x__ and __y.__ By analogy with graceful labelings, we say that a labeling of the ve
## Abstract In 1960 Ore proved the following theorem: Let __G__ be a graph of order __n__. If __d__(__u__) + __d__(__v__)โฅ__n__ for every pair of nonadjacent vertices __u__ and __v__, then __G__ is hamiltonian. Since then for several other graph properties similar sufficient degree conditions have
## Abstract Let __k__ be a positive integer, and __S__ a nonempty set of positive integers. Suppose that __G__ is a connected graph containing a path of length __k__, and that each path __P__ of length __k__ in __G__ is contained in some cycle __C__(__P__) of length s โ __S__. We prove that every p