A graph G is said to be hom-idempotent if there is a homomorphism from G 2 to G, and weakly hom-idempotent if for some n β₯ 1 there is a homomorphism from G n+1 to G n . We characterize both classes of graphs in terms of a special class of Cayley graphs called normal Cayley graphs. This allows us to
Channel assignment on Cayley graphs
β Scribed by Patrick Bahls
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 100 KB
- Volume
- 67
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
β¦ Synopsis
We address various channel assignment problems on the Cayley graphs of certain groups, computing the frequency spans by applying group theoretic techniques. In particular, we show that if G is the Cayley graph of an n-generated group with a certain kind of presentation, then (G; k, 1) β€ 2(k +n-1). For certain values of k this bound gives the obvious optimal value for any 2n-regular graph. A large number of groups (for instance, even Artin groups and a number of Baumslag-Solitar groups) satisfy this condition.
π SIMILAR VOLUMES
The vertex-labeling of graphs with nonnegative integers provides a natural setting in which to study problems of radio channel assignment. Vertices correspond to transmitter locations and their labels to radio channels. As a model for the way in which interference is avoided in real radio systems, e
The issue of when two Cayley digraphs on different abelian groups of prime power order can be isomorphic is examined. This had previously been determined by Anne Joseph for squares of primes; her results are extended.
A Cayley graph Cay(G, S) of a group G is called a CI-graph if whenever T is another subset of G for which Cay(G, S) βΌ = Cay(G, T ), there exists an automorphism Ο of G such that S Ο = T . For a positive integer m, the group G is said to have the m-CI property if all Cayley graphs of G of valency m a
## Abstract In 1983, the second author [D. MaruΕ‘iΔ, Ars Combinatoria 16B (1983), 297β302] asked for which positive integers __n__ there exists a nonβCayley vertexβtransitive graph on __n__ vertices. (The term __nonβCayley numbers__ has later been given to such integers.) Motivated by this problem,
A Cayley graph or digraph Cay(G, S) of a finite group G is called a CI-graph of G if, for any T/G, Cay(G, S)$Cay(G, T) if and only if S \_ =T for some \_ # Aut(G). We study the problem of determining which Cayley graphs and digraphs for a given group are CI-graphs. A finite group G is called a conne