On the covering graph of balanced lattices
โ Scribed by Manfred Stern
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 283 KB
- Volume
- 156
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
โฆ Synopsis
Jakubik has shown that for discrete modular lattices all graph isomorphisms are given by certain direct product decompositions. Duffus and Rival have proved a similar theorem for graded lattices which are atomistic and coatomistic. Modifying some of the results of Duffus and Rival we give a common generalization proved for lattices which are balanced and graded.
๐ SIMILAR VOLUMES
For a graph G = (V,E), a vertex set XC\_ V is called a clique if Ixl>~2 and the graph G [X] induced by X is a complete subgraph maximal under inclusion. We say that a vertex set T is a clique-transversal set if T N X ~ 0 for all cliques X of G, and define the clique-transversal number re(G) as the m
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Following [1] , we investigate the problem of covering a graph G with induced subgraphs G 1 ; . . . ; G k of possibly smaller chromatic number, but such that for every vertex u of G, the sum of reciprocals of the chromatic numbers of the G i 's containing u is at least 1. The existence of such ''ch