On the decomposition threshold of a given graph
On the decomposition threshold of a given graph
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关于给定图的分解阈值
DOI:
10.1016/j.jctb.2019.02.010
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Glock S
中科院分区:
文献类型:
--
作者:
Glock S
We study the F-decomposition threshold δ F for a given graph F. Here an F-decomposition of a graph G is a collection of edge-disjoint copies of F in G which together cover every edge of G.(Such an F-decomposition can only exist if G is F-divisible, ie if e (F)| e (G) and each vertex degree of G can be expressed as a linear combination of the vertex degrees of F.) The F-decomposition threshold δ F is the smallest value ensuring that an F-divisible graph G on n vertices with δ (G)≥(δ F+ o (1)) n has an F-decomposition. Our main results imply the following for a given graph F, where δ F⁎ is the fractional version of δ F and χ:= χ (F):(i) δ F≤ max{δ F⁎, 1− 1/(χ+ 1)};(ii) if χ≥ 5, then δ F∈{δ F⁎, 1− 1/χ, 1− 1/(χ+ 1)};(iii) we determine δ F if F is bipartite. In particular,(i) implies that δ K r= δ K r⁎. Our proof involves further developments of the recent ‘iterative’absorbing approach.
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DOI:
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发表时间:
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期刊:
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影响因子:
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DOI:
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期刊:
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影响因子:
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DOI:
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期刊:
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影响因子:
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