Uma generalização de fatores em graficos

AUTOR(ES)
DATA DE PUBLICAÇÃO

1982

RESUMO

A necessary and sufficient condition for a finite graph to have spanning subgraph in which the degree of each vertex lies in a specified interval is presented. This result generalizes others that were obtained by Hall and Tutte, in which the interval of each vertex is reduced to a single point. The proof is constructive and a polinomial algorithm is obtained. This algorithm determines a subgraph which in a well defined sense, is as close as possible to the desired specifications. It is shown that when we associate weights with the edges, the problem becomes NP-complete. Some direct applications of the theorem are also presented which include flows in networks and graphic sequences.

ASSUNTO(S)

teoria dos grafos

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