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Hiroshima Mathematical Journal
Article . 2006 . Peer-reviewed
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Hiroshima Mathematical Journal
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Disjoint stars and forbidden subgraphs

Authors: Fujita, Shinya;

Disjoint stars and forbidden subgraphs

Abstract

Let $r,k$ be integers with $r\ge 3, k\ge 2$. We prove that if $G$ is a $K_{1,r}$-free graph of order at least $(k-1)(2r-1)+1$ with $\delta(G)\ge 2$, then $G$ contains $k$ vertex-disjoint copies of $K_{1,2}$. This result is motivated by the problem of characterizing a forbidden subgraph $H$ which satisfies the statement "every $H$-free graph of sufficiently large order with minimum degree at least $t$ contains $k$ vertex-disjoint copies of a star $K_{1,t}$." In this paper, we also give the answer to this problem.

Keywords

Claw-free, star, 05C70, 05C75, vertex-disjoint, forbidden subgraphs

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
7
Average
Top 10%
Average
Green
gold