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引用次数: 2
摘要
在J. Donald Monk的《布尔代数上的基数不变量》一书中，对许多这样的基数函数进行了定义和研究。其中有几个是众所周知的连续体基本特征的概括。此外，还列出了一长串尚未解决的问题。关注这些基本不变量中的六个，其中一些问题在这里得到了答案，在大多数情况下是一个明确的答案。他们中的大多数可以分为两类。第一组问题是关于从一个给定的无限布尔代数到它的简单扩展时这些基本函数的变化，而第二组问题是关于一对给定的无限布尔代数和它们的自由积之间的比较。
Questions on cardinal invariants of Boolean algebras
In the book Cardinal Invariants on Boolean Algebras by J. Donald Monk many such cardinal functions are defined and studied. Among them several are generalizations of well known cardinal characteristics of the continuum. Alongside a long list of open problems is given. Focusing on half a dozen of those cardinal invariants some of those problems are given an answer here, which in most of the cases is a definitive one. Most of them can be divided in two groups. The problems of the first group ask about the change on those cardinal functions when going from a given infinite Boolean algebra to its simple extensions, while in the second group the comparison is between a couple of given infinite Boolean algebras and their free product.
期刊介绍：
The journal publishes research papers and occasionally surveys or expositions on mathematical logic. Contributions are also welcomed from other related areas, such as theoretical computer science or philosophy, as long as the methods of mathematical logic play a significant role. The journal therefore addresses logicians and mathematicians, computer scientists, and philosophers who are interested in the applications of mathematical logic in their own field, as well as its interactions with other areas of research.
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