Fraïssé结构的厚、连接和分段连接子集
Thick, syndetic, and piecewise syndetic subsets of Fraïssé structures
摘要:
我们定义和进行系统的研究厚,联会,分段联会的Fraïssé结构的子集。这些集合中的每一个都形成了一个家庭的意义上的Akin和Reynner [AG],我们定义和研究超滤对每个家庭,特别注意超滤厚集。在这个过程中,我们推广了Bergelson,Hindman和McCutcheon [BHM]的许多结果。我们还讨论了一些抽象的问题,家庭隐含在工作中的阿金和Reynner。
英文摘要:
We define and undertake a systematic study of thick, syndetic, and piecewise syndetic subsets of a Fraïssé structure. Each of these collections forms a family in the sense of Akin and Glasner [AG], and we define and study ultrafilters on each of these families, paying special attention to ultrafilters on the thick sets. In the process, we generalize many results of Bergelson, Hindman, and McCutcheon [BHM]. We also discuss some abstract questions about families implicit in the work of Akin and Glasner.
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