For all \(\varepsilon>0\), we construct graphs with \(n\) vertices and \(>n^{2-n}\) edges, for arbitrarily large \(n\), such that the neighborhood of each vertex is a cycle. This result is asymptotically best possible. "1995 Academic Press. Inc.
Class of graphs with restricted neighborhoods
โ Scribed by Kim T. Rawlinson; R. C. Entringer
- Publisher
- John Wiley and Sons
- Year
- 1979
- Tongue
- English
- Weight
- 286 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
โฆ Synopsis
Abstract
A description is obtained for connected graphs in which a point u is adjacent of v only if u is adjacent to all points whose degree is greater than that of v. The minimum number of lines in such a grpah with all points having degree at least d is also determined. Finally, an application to communication systems is discussed.
๐ SIMILAR VOLUMES
It is shown that the chromatic number of any graph with maximum degree d in which the number of edges in the induced subgraph on the set of all neighbors of any vertex does not exceed d 2 รf is at most O(dรlog f ). This is tight (up to a constant factor) for all admissible values of d and f.
## Abstract Orderly algorithms for the generation of exhaustive lists of nonisomorphic graphs are discussed. The existence of orderly methods to generate the graphs with a given subgraph and without a given subgraph is established. This method can be used to list all the nonisomorphic subgraphs of
## Abstract Restricted edge connectivity is a more refined network reliability index than edge connectivity. For a connected graph __G__ = (__V__, __E__), an edge set __S__ โ __E__ is a restricted edge cut if __G__ โ __S__ is disconnected and every component of __G__ โ __S__ has at least two vertic
## Abstract We obtain lower bounds on the size of a maximum matching in a graph satisfying the condition |__N(X)__| โฅ __s__ for every independent set __X__ of __m__ vertices, thus generalizing results of Faudree, Gould, Jacobson, and Schelp for the case __m__ = 2.
## Abstract Matrix symmetrization and several related problems have an extensive literature, with a recurring ambiguity regarding their complexity and relation to graph isomorphism. We present a short survey of these problems to clarify their status. In particular, we recall results from the litera