Equitable colourings of Borel graphs

Equitable colourings of Borel graphs
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Borel 图的公平着色

DOI:
10.1017/fmp.2021.12
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发表时间:
2021
期刊:
Pi
影响因子:
--
通讯作者:
Conley, Clinton T.
Conley, Clinton T.
中科院分区:
--
文献类型:
--
作者:
Bernshteyn, Anton;Conley, Clinton T.

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Hajna和Szemerédi证明了:如果G是一个有最大度的有限图,则对每个整数,G都有一个k色的真染色,其中每两个色类的大小至多相差1,这样的染色被称为平均染色。在Borel集下,我们得到了无限图的类似结果。具体地说,如果G是有限最大度的非周期Borel图,则对每个图,G都有一个Borel真k-染色,其中每两个色类都由G的Borel满半群的一个元素联系在一起。我们还建立了Kostochka和Nakprset关于平均度小的图的均匀着色的一个结果的一个可测版本。也就是说,如果G在顶点上不含团,且是一个无原子的G-不变概率度量,使得G关于的平均次数至多为,则G有-均匀染色。作为这一结果的证明步骤,我们建立了由于Kostochka和Nakprite而加强的Brooks定理的可测和列表着色扩张。
Hajnal and Szemerédi proved that if G is a finite graph with maximum degree , then for every integer , G has a proper colouring with k colours in which every two colour classes differ in size at most by ; such colourings are called equitable. We obtain an analogue of this result for infinite graphs in the Borel setting. Specifically, we show that if G is an aperiodic Borel graph of finite maximum degree , then for each , G has a Borel proper k-colouring in which every two colour classes are related by an element of the Borel full semigroup of G. In particular, such colourings are equitable with respect to every G-invariant probability measure. We also establish a measurable version of a result of Kostochka and Nakprasit on equitable -colourings of graphs with small average degree. Namely, we prove that if , G does not contain a clique on vertices and is an atomless G-invariant probability measure such that the average degree of G with respect to is at most , then G has a -equitable -colouring. As steps toward the proof of this result, we establish measurable and list-colouring extensions of a strengthening of Brooks’ theorem due to Kostochka and Nakprasit.
可测量颜色的布鲁克斯定理
DOI: --
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