8 research outputs found
Ideals on countable sets: a survey with questions
An ideal on a set is a collection of subsets of 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
Ideals on countable sets: a survey with questions
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