## Abstract Let __p__ and __C__~4~ (__G__) be the number of vertices and the number of 4βcycles of a maximal planar graph __G__, respectively. Hakimi and Schmeichel characterized those graphs __G__ for which __C__~4~ (__G__) = 1/2(__p__^2^ + 3__p__ β 22). This characterization is correct if __p__ β₯
On the number of cycles of short length in the DE Bruijn-good graph Gn
β Scribed by Zhe-xian Wan; Rong-hua Xiong; Min-an Yu
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 865 KB
- Volume
- 62
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
β¦ Synopsis
An algebraic approach to enumerate the number of cycles of short length in the de Bruijn-Good graph Gn is given and the following theorem is proved.
where ~)k,m--1 is defined to be the number of positive integers l <<-k satisfying (k, l) <<-m -1, l~(q) is the M6bius function, dt = (k, l), e~ = 0 or j -1 according as j = 0 or j > O, and fl(k, k) = 1/ k Edlk p(d)2 k/a.
π SIMILAR VOLUMES
Let G be a maximal planar graph with p vertices, and let Ck(G) denote the number of cycles of length k in G. We first present tight bounds for C,(G) and C,(G) in terms of p. We then give bounds for Ck(G) when 5 5 k 5 p , and consider in particular bounds for C,(G), in terms of p. Some conjectures an
The set of different cycle lengths of a graph G is denoted by C(G). We study how the distribution of C(G) depends on the minimum degree of G. We prove two results indicating that C(G) is dense in some sense. These results lead to the solution of a conjecture of Erdos and Hajnal stating that for suit
## Abstract Let __G__ be a graph on __p__ vertices with __q__ edges and let __r__β=β__q__βββ__p__β=β1. We show that __G__ has at most ${15\over 16} 2^{r}$ cycles. We also show that if __G__ is planar, then __G__ has at most 2^__r__βββ1^β=β__o__(2^__r__βββ1^) cycles. The planar result is best possib
Let a random graph G be constructed by adding random edges one by one, starting with n isolated vertices. We show that with probability going to one as n goes to infinity, when G first has minimum degree two, it has at least (log n)('-')" distinct hamilton cycles for any fixed E > 0.