All These Approximate Ramsey Properties

All These Approximate Ramsey Properties
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所有这些近似拉姆齐属性

DOI:
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发表时间:
2023
期刊:
影响因子:
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通讯作者:
Aristotelis
Aristotelis
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文献类型:
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作者:
Nadav Meir;Aristotelis

文献摘要

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我们考虑(嵌入的)Ramsey性质的有限逼近。利用随机序超图的一类齐次约简,我们证明了这些性质构成了一个严格的层次。我们还证明了每一个大小不超过2的结构都是“Ramsey对象”的有限结构类本质上由有序结构组成,推广了关于可数Ramsey类的一个已知结果。
We consider finitary approximations of the (embedding) Ramsey property. Using a class of homogeneous reducts of random ordered hypergraphs, we prove that these properties form a strict hierarchy. We also show that every class of finite structures in which every structure of size at most 2 is a"Ramsey object"essentially consists of ordered structures, generalising a known result for countable Ramsey classes.