Let G G G = (V V V, E E E) be a graph and let g g g and f f f be two integervalued functions defined on V V V such that k k k β€ β€ β€ g g g(x x x) β€ β€ β€ f f f(x x x) for all x x x β β β V
Orthogonal (g,f)-factorizations in graphs
β Scribed by Guizhen Liu
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 362 KB
- Volume
- 143
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
β¦ Synopsis
LetGbeagraphandletF={F,,F,,..., F,,,} and H be a factorization and a subgraph of G, respectively. If H has exactly one edge in common with Fi for all i, 1 < i < m, then we say that F is orthogonal to H. Let g andf be two integer-valued functions defined on V(G) such that g(x) < f(x) for every x E V(G). In this paper it is proved that for any m-matching M of an (mg + m -l,mf-m + 1)-graph G, there exists a (g,f)-factorization of G orthogonal to M.
π SIMILAR VOLUMES
## Abstract Let __G__ be a graph with vertex set __V__(__G__) and edge set __E__(__G__). Let __k__~1~, __k__~2~,β¦,__k__~m~ be positive integers. It is proved in this study that every [0,__k__~1~+β¦+__k__~__m__~β__m__+1]βgraph __G__ has a [0, __k__~i~]~1~^__m__^βfactorization orthogonal to any given
Chen, W. Y. C., Maximum (g, f)-factors of a general graph, Discrete Mathematics 91 (1991) l-7. This paper presents a characterization of maximum (g, f)-factors of a general graph in which multiple edges and loops are allowed. An analogous characterization of the minimum (g,f)-factors of a general gr
Let G be a graph with vertex set V and let g, f : V Γ Z + . We say that G has all ( g, f )-factors if G has an h-factor for every h: V Γ Z + such that g(v) h(v) f (v) for every v # V and at least one such h exists. In this note, we derive from Tutte's f-factor theorem a similar characterization for
We give sufficient conditions for a graph to have a (g,f)-factor. For example, we prove that a graph G has a (g,f)-factor if g(v) < f(v) for all vertices v of G and g(x)/deg~(x) <~ f(y)/deg~(y) for all adjacent vertices x and y of G.