Decomposition of the completer-graph into completer-partiter-graphs

Decomposition of the completer-graph into completer-partiter-graphs
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将完整图分解为完整部分图

DOI:
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发表时间:
1986
期刊:
Graphs Comb.
影响因子:
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通讯作者:
Noga Alon
Noga Alon
中科院分区:
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文献类型:
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作者:
Noga Alon

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对于n ≥ r ≥ 1,让fr(n)表示最小数q,即有可能将n个顶点上的完形图的所有边分割成q个完形分割图。格雷厄姆和波拉克证明了 f2(n) =n - 1。在这里,我们观察到 f3(n) =n - 2,并证明对于每个固定的 r ≥ 2,都存在正常数 c1(r) 和 c2(r),使得对于所有 n ≥ r,c1(r) ≤fr(n)⋅n-[r/2] ≤n2(r)。证明使用了一些简单的线性代数思想。
Forn ≥ r ≥ 1, letfr(n) denote the minimum numberq, such that it is possible to partition all edges of the completer-graph onn vertices intoq completer-partiter-graphs. Graham and Pollak showed thatf2(n) =n − 1. Here we observe thatf3(n) =n − 2 and show that for every fixedr ≥ 2, there are positive constantsc1(r) andc2(r) such thatc1(r) ≤fr(n)⋅n−[r/2] ≤n2(r) for alln ≥ r. This solves a problem of Aharoni and Linial. The proof uses some simple ideas of linear algebra.