Carlos Uzcategui
Published 2019-02-22Version 1
An ideal on a set $X$ is a collection of subsets of $X$ closed under the operations of taking finite unions and subsets of its elements. Ideals are a very useful notion in topology and set theory and have been studied for a long time. We present a survey of results about ideals on countable sets and include many open questions.
Journal: Ideals on countable sets: a survey with questions, Rev. Integr. temas mat. 37 (2019), No. 1, 167-198
Logic Blog 2014
Incomparable $ω_1$-like models of set theory
On the local closure of clones on countable sets
![QR code for arXiv:1902.08677 [math.LO]](http://oss.arxitics.com/images/favicon.svg)