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On the structure of Borel ideals in-between the ideals ED and Fin ⊗ Fin in the Katětov order
Annals of Pure and Applied Logic ( IF 0.6 ) Pub Date : 2021-04-15 , DOI: 10.1016/j.apal.2021.102976 Pratulananda Das , Rafał Filipów , Szymon Gła̧b , Jacek Tryba
中文翻译:
关于理想之间的Borel理想的结构 和Kat⊗tov秩序中的Fin⊗Fin
更新日期:2021-04-19
Annals of Pure and Applied Logic ( IF 0.6 ) Pub Date : 2021-04-15 , DOI: 10.1016/j.apal.2021.102976 Pratulananda Das , Rafał Filipów , Szymon Gła̧b , Jacek Tryba
For a family we define the ideal on to be the ideal generated by the family Using ideals of the form , we show that the structure of Borel ideals in-between two well known Borel ideals and in the Katětov order is fairly complicated. Namely, there is a copy of in-between and , and consequently there are increasing and decreasing chains of length and antichains of size .
中文翻译:
关于理想之间的Borel理想的结构 和Kat⊗tov秩序中的Fin⊗Fin
对于一个家庭 我们定义理想 上 成为家庭的理想 使用形式的理想 ,我们证明了两个著名的Borel理想之间的Borel理想的结构 和卡捷夫(Katětov)的命令相当复杂。即,有一个副本 中间的 和 ,因此长度的链条增加和减少 和大小的反链 。