with β¦ G G V r2 q 10 h V log V , and h y 1 divides E , then there is a decomposition of the edges of G into copies of H. This result is asymptotically the best possible for all trees with at least three vertices.
Generation of trees of a graph with the use of decomposition
β Scribed by Jacek Wojciechowski
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 1015 KB
- Volume
- 318
- Category
- Article
- ISSN
- 0016-0032
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β¦ Synopsis
The method of tree generation of a graph decomposed into any number of parts is described in this paper. The decomposition of a graph is dejined. Theformulafor the generation of trees of a decomposed graph is given in Theorem I. The necessary and suflcient conditions which a graph decomposition must satisfy to avoid duplications in the generated set of trees are discussed and results are summarized in Theorems I1 and III. A criterion for existence of such a decomposition is formulated in Theorem IV and also an appropriate algorithm for the graph decomposition is suggested.
π SIMILAR VOLUMES
Let H be a tree on h 2 vertices. It is shown that if n is sufficiently large and G=(V, E ) is an n-vertex graph with $(G) wnΓ2x , then there are w |E |Γ(h&1)x edge-disjoint subgraphs of G which are isomorphic to H. In particular, if h&1 divides |E | then there is an H-decomposition of G. This result
A special graph, the PS graph, is introduced and an algorithm is developed to generate all trees of such graphs. It is proved that for any given graph, G there exists certain number of PS graphs, obtained from G, such that the collection of all trees of all such PS graph span all trees of G with no
A partition of the edge set of a graph H into subsets inducing graphs H,, . . . , H, isomorphic to a graph G is said to be a G-decomposition of H. A G-decomposition of H is resolvable if the set {H,, . . . , H,} can be partitioned into subsets, called resolution classes, such that each vertex of H
## Abstract We investigate tree decompositions (__T__,(__X__~t~)~tΟ΅V(T)~) whose width is βclose to optimalβ and such that all the subtrees of __T__ induced by the vertices of the graph are βsmall.β We prove the existence of such decompositions for various interpretations of βclose to optimalβ and β