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STRUCTURE OF SUMMABLE TALL IDEALS UNDER KATĚTOV ORDER

Part of: Set theory

Published online by Cambridge University Press:  20 April 2023

JIALIANG HE ,
ZUOHENG LI  and
SHUGUO ZHANG
JIALIANG HE
Affiliation:
COLLEGE OF MATHEMATICS SICHUAN UNIVERSITY NO. 24 SOUTH SECTION 1, YIHUAN ROAD CHENGDU 610065, SICHUAN, CHINA E-mail: jialianghe@scu.edu.cn E-mail: zhangsg@scu.edu.cn
ZUOHENG LI*
Affiliation:
COLLEGE OF MATHEMATICS SICHUAN UNIVERSITY NO. 24 SOUTH SECTION 1, YIHUAN ROAD CHENGDU 610065, SICHUAN, CHINA E-mail: jialianghe@scu.edu.cn E-mail: zhangsg@scu.edu.cn
SHUGUO ZHANG
Affiliation:
COLLEGE OF MATHEMATICS SICHUAN UNIVERSITY NO. 24 SOUTH SECTION 1, YIHUAN ROAD CHENGDU 610065, SICHUAN, CHINA E-mail: jialianghe@scu.edu.cn E-mail: zhangsg@scu.edu.cn
*
E-mail: 18653730429@163.com
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Abstract

We show that Katětov and Rudin–Blass orders on summable tall ideals coincide. We prove that Katětov order on summable tall ideals is Galois–Tukey equivalent to $(\omega ^\omega ,\le ^*)$ . It follows that Katětov order on summable tall ideals is upwards directed which answers a question of Minami and Sakai. In addition, we prove that ${l_\infty }$ is Borel bireducible to an equivalence relation induced by Katětov order on summable tall ideals.

Keywords

summable idealKatětov orderGalois–Tukey connection

MSC classification

Primary: 03E05: Other combinatorial set theory
Secondary: 03E15: Descriptive set theory 03E04: Ordered sets and their cofinalities; pcf theory
Type
Article
Information
The Journal of Symbolic Logic , First View , pp. 1 - 27
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of The Association for Symbolic Logic

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References

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