Is the collection of all cardinalities a set or a proper class?
93330
Cardinality of all cardinalities
30519
"Real" cardinality, say, $\aleph_\pi$?
150790
Prove two sets have same Cardinality by writing down bijection
132537
Class of sets of a given infinite cardinality
156006
Cardinality of set containing all infinite subsets of $\mathbb{Q}$
62687
Proving Cardinality of Cosets in Abstract Algebra
40071
What is the cardinality of the set of all topologies on $\mathbb{R}$?
45878
Elementary Set Theory: Ordinals, Well Orderings and Isomorphisms
108957
Cardinality of a totally ordered union
9651
Cardinality of cartesian product of an infinite set with N
97951
Is the void set (∅) a proper subset of every set?
146436
Cardinality of the set of bijective functions on $\mathbb{N}$?
155168
Is the collection of finite subsets of $\mathbb{Z}$ countable?
85099
How many subsets of $\mathbb{N}$ have the same cardinality as $\mathbb{N}$?
144735
Possible cardinality of power sets
109054
Given an infinite set of cardinality $X$, is there a chain in $\mathcal P(X)$ of the same cardinalty of $\mathcal P(X)$?
21392
What is the difference between a class and a set?