Size of infinite sets
132025
Is there an alternative to Cantor's cardinalities that makes proper subsets smaller than their sets?
272
Cantor Sets/nonempty/cardinality
68230
The cardinality of a countable union of sets with less than continuum cardinality
50880
Expressing $\Bbb N$ as an infinite union of disjoint infinite subsets.
126569
Can we find a well ordering on an infinite set with no largest element?
91237
Every infinite set contains a countable subset
76135
Limit of a particular variety of infinite product/series
35692
The set of all finite subsets of the natural numbers is countable
93389
Uncountable sets of Hausdorff dimension zero
69838
Does a countably infinite power set exist?
64193
Cardinality of Infinite Symmetric group
126015
Elementary number theory in sets
137621
The Number of Topologies on a Finite Set
39692
The length of an interval covered by an infinite family of open intervals
125411
Infinite set always has a countably infinite subset
31969
Partition of N into infinite number of infinite disjoint sets?
122947
What is the cardinality of the set of infinite cardinalities?