LOWER BOUNDS FOR ESTRADA INDEX
LOWER BOUNDS FOR ESTRADA INDEX
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DOI:
10.2298/pim0897001g
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发表时间:
2008
期刊:
影响因子:
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通讯作者:
I. Gutman
中科院分区:
文献类型:
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作者:
I. Gutman
If G is an (n, m)-graph whose spectrum consists of the numbers λ1 ,λ 2 ,...,λ n, then its Estrada index is EE(G )= n=1 e λi. We establish lower bounds for EE(G )i n terms ofn and m.