On the number of complete subgraphs of a graph II

On the number of complete subgraphs of a graph II
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DOI:
10.1007/978-3-0348-5438-2_41
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发表时间:
1983
期刊:
--
影响因子:
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通讯作者:
L. Lovász;M. Simonovits
L. Lovász;M. Simonovits
中科院分区:
其他
文献类型:
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作者:
L. Lovász;M. Simonovits

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本文推广了P. Erdlers和L. Moser及J. W. Moon的一些结果,给出了完全p-图的个数Kp的下界。进一步,对于n和E的某些值,我们给出了极图的一个完全刻画,即. e.我们的结果证明了P. Erdens的猜想:当k <n/2时,具有[n ~ 2/4] +kedges的图G_n至少包含个三角形。
Generalizing some results of P.Erdősand some of L.Moserand J. W.Moonwe give lower bounds on the number of completep-graphsKpof graphs in terms of the numbers of vertices and edges. Further, for some values ofnandEwe give a complete characterization of the extremal graphs, i. e. the graphsSofnvertices andEedges having minimum number ofKp’s.Our results contain the proof of the longstanding conjecture of P.Erdősthat a graphGnwith [n2/4] +kedges contains at leasttriangles ifk<n/2.