The connectivity of a graph and its complement

The connectivity of a graph and its complement
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DOI:
10.1016/j.dam.2008.05.012
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发表时间:
2008-10
期刊:
Discret. Appl. Math.
影响因子:
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通讯作者:
Angelika Hellwig;L. Volkmann
Angelika Hellwig;L. Volkmann
中科院分区:
其他
文献类型:
--
作者:
Angelika Hellwig;L. Volkmann

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设G是最小度δ(G),边连通度λ(G),点连通度κ(G)的图,G的补图为G的补图.本文证明了λ(G)=δ(G)或λ(G <$)=δ(G <$).此外,我们还得到了Nordhaus-Gaddum型结果κ(G)+κ(G <$)≥min{δ(G),δ(G <$)}+1.一组例子将表明,这种不等式是最好的可能。
Let G be a graph with minimum degree δ(G), edge-connectivity λ(G), vertex-connectivity κ(G), and let Ḡ be the complement of G. In this article we prove that either λ(G)=δ(G) or λ(Ḡ)=δ(Ḡ). In addition, we present the Nordhaus–Gaddum type result κ(G)+κ(Ḡ)≥min{δ(G),δ(Ḡ)}+1. A family of examples will show that this inequality is best possible.