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Minimum rank and path cover number for generalized and double generalized cycle star graphs
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Resumo(s)
For a given connected (undirected) graph G=(V,E), with V={1,…,n}, the minimum rank of G is defined to be the smallest possible rank over all symmetric matrices A=[aij] such that for i≠j, aij=0 if, and only if, {i,j}∉E. The path cover number of G is the minimum number of vertex-disjoint paths occurring as induced subgraphs of G that cover all the vertices of G. When G is a tree, the values of the minimum rank and of the path cover number are known as well the relationship between them. We study these values and their relationship for all graphs that have at most two vertices of degree greater than two: generalized cycle stars and double generalized cycle stars.
Descrição
This work was partially supported by the "Fundacao para a Ciencia e Tecnologia" (Portuguese Foundation for Science and Technology) through the project UID/MAT/00297/2013 (Centro de Matematica e Aplicacoes).
This work was partially supported by the "Fundacao para a Ciencia e Tecnologia" (Portuguese Foundation for Science and Technology) through the project UID/MAT/04721/2013 (Centro de Analise Funcional e Estruturas Lineares).
Palavras-chave
Cycle Double generalized cycle star Generalized cycle star Generalized star Graphs Maximum multiplicity Minimum rank Path cover number Symmetric matrices Algebra and Number Theory Numerical Analysis Geometry and Topology Discrete Mathematics and Combinatorics