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

Jose Uzcategui, Percussion

I Ching / Per Nørgård; OMAR / Franco Donatoni; Pillar IV / Andy Akiho; One Study One Summary: Etude / John Psathas; Monkey Chant / Glenn Kotch