Controlling cardinal characteristics without adding reals

IF 0.9 1区 数学 Q1 LOGIC
M. Goldstern, Jakob Kellner, D. Mej'ia, S. Shelah
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引用次数: 9

Abstract

We investigate the behavior of cardinal characteristics of the reals under extensions that do not add new [Formula: see text]-sequences (for some regular [Formula: see text]). As an application, we show that consistently the following cardinal characteristics can be different: The (“independent”) characteristics in Cichoń’s diagram, plus [Formula: see text]. (So we get thirteen different values, including [Formula: see text] and continuum). We also give constructions to alternatively separate other MA-numbers (instead of [Formula: see text]), namely: MA for [Formula: see text]-Knaster from MA for [Formula: see text]-Knaster; and MA for the union of all [Formula: see text]-Knaster forcings from MA for precaliber.
不加实量而控制基本特性
我们研究了实数在不添加新[公式:见文]-序列(对于一些正则[公式:见文])的扩展下的基本特征的行为。作为一个应用,我们一致地证明了以下基本特征可以是不同的:cichoski图中的(“独立的”)特征,加上[公式:见文本]。(所以我们得到13个不同的值,包括[公式:见文本]和连续体)。我们还给出了可替换地分离其他MA数的结构(而不是[公式:见文本]),即:MA表示[公式:见文本]-Knaster, MA表示[公式:见文本]-Knaster;和MA为所有的联合[公式:见文本]-从MA为预制件的knaster力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Mathematical Logic
Journal of Mathematical Logic MATHEMATICS-LOGIC
CiteScore
1.60
自引率
11.10%
发文量
23
审稿时长
>12 weeks
期刊介绍: The Journal of Mathematical Logic (JML) provides an important forum for the communication of original contributions in all areas of mathematical logic and its applications. It aims at publishing papers at the highest level of mathematical creativity and sophistication. JML intends to represent the most important and innovative developments in the subject.
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