A Short Proof of the Hajnal–Szemerédi Theorem on Equitable Colouring

A Short Proof of the Hajnal–Szemerédi Theorem on Equitable Colouring
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DOI:
10.1017/s0963548307008619
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发表时间:
2008-03
期刊:
Combinatorics, Probability and Computing
影响因子:
--
通讯作者:
H. Kierstead;A. Kostochka
H. Kierstead;A. Kostochka
中科院分区:
其他
文献类型:
--
作者:
H. Kierstead;A. Kostochka

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如果颜色类的大小相差至多一个,则图的适当顶点着色是公平的。我们给出了著名的Hajal-Szemerédi定理的一个新的较短的证明:对于每个正整数r,每个最大度至多r的图都有r+1个色的均匀着色。证明给出了这种着色的多项式时间算法。
A proper vertex colouring of a graph is equitable if the sizes of colour classes differ by at most one. We present a new shorter proof of the celebrated Hajnal–Szemerédi theorem: for every positive integer r, every graph with maximum degree at most r has an equitable colouring with r+1 colours. The proof yields a polynomial time algorithm for such colourings.