Vertex-disjoint copies of K1, 3 in K1, r-free graphs

Vertex-disjoint copies of K1, 3 in K1, r-free graphs
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K1 的顶点不相交副本,K1 中的 3,无 r 图

DOI:
10.1016/j.disc.2016.06.015
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发表时间:
2016
期刊:
Discret. Math.
影响因子:
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通讯作者:
Jin Yan
Jin Yan
中科院分区:
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文献类型:
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作者:
Suyun Jiang;Jin Yan

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一个图G称为K1,r-free,如果G不包含同构于K1,r的导出子图.设k,r为整数,k≥ 2,r≥ 4.本文证明了:如果G是阶至少为(k− 1)(3 r− 2)+ 1且δ(G)≥ 3的无K1,r的图,则G包含K1,3的k个点不相交副本.这个结果表明藤田猜想(2008)对t= 3和r≥ 4成立。
A graph G is said to be K 1, r-free if G does not contain an induced subgraph isomorphic to K 1, r. Let k, r be integers with k≥ 2, r≥ 4. In this paper, we prove that if G is a K 1, r-free graph of order at least (k− 1)(3 r− 2)+ 1 with δ (G)≥ 3, then G contains k vertex-disjoint copies of K 1, 3. This result shows that Fujita’s conjecture (2008) is true for t= 3 and r≥ 4.