## 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
On the maximum number of pairwise compatible euler cycles
β Scribed by H. Fleischner; A. J. W. Hilton; Bill Jackson
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 629 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
B. Jackson [4] made the following conjecture: If G is an Eulerian graph with Ξ΄(G) β₯ 2__k__, then G has a set of 2__k__ β 2 pairwise compatible Euler cycles (i.e., every pair of adjacent edges appears in at most one of these Euler cycles as a pair of consecutive edges). We verify this conjecture in the case where every circuit of G is a block of G.
π SIMILAR VOLUMES
Let G=(V 1 , V 2 ; E ) be a bipartite graph with |V 1 |= |V 2 | =n 2k, where k is a positive integer. Suppose that the minimum degree of G is at least k+1. We show that if n>2k, then G contains k vertex-disjoint cycles. We also show that if n=2k, then G contains k&1 quadrilaterals and a path of orde
Shi, Y., The number of edges in a maximum cycle-distributed graph, Discrete Mathematics 104 (1992) 205-209. Let f(n) (f\*(n)) be the maximum possible number of edges in a graph (2-connected simple graph) on n vertices in which no two cycles prove that, for every integer n > 3, f(n) 3 n + k + [i( [~(
Soit H = (X. ~1 un hypergraphe h-uniforme avec IX] = net soit L h ~(H! le graphe Jont les sommets reprdsentent les arates de H, deux sommets 6lant reli6s si et seulement si t~s z~r6tes qu'ils reprdsen!ent intersectent en h -1 sommet,=. Nous montrons que sif,, t(H) ne contienl pas de cycle, alors I~[