期刊
APPLIED MATHEMATICS LETTERS
卷 25, 期 10, 页码 1435-1438出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.aml.2011.12.018
关键词
Narumi-Katayama index; Graph; Degree (of vertex); Extremal graphs
资金
- Serbian Ministry of Science [174033]
The Narumi-Katayama index of a graph G, denoted by NK (G), is equal to the product of the degrees of the vertices of G. For various classes of graphs, we characterize the graphs G for which NK (G) assumes an extremal (minimal or maximal) value. (c) 2011 Elsevier Ltd. All rights reserved.
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