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:
影响因子:
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通讯作者:
H. Kierstead;A. Kostochka
中科院分区:
文献类型:
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作者:
H. Kierstead;A. Kostochka
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.