Cardinality of a set of all subsets of $P(\omega)$ with cardinality $\omega$
66301
The cardinality of the set of countably infinite subsets of an infinite set
45216
Cardinality of $[0,1]$
65768
What is the cardinality of the set of the empty set?
9158
Proving that a propositional theory of any cardinality has an independent set of axioms
9651
Cardinality of cartesian product of an infinite set with N
114262
Find the cardinality of the following set $S_n=\{(x,y)|x^2+y^2=n, \text{where }x,y,n \in \mathbb Z\text{ and }n\geq0 \}$
7785
Cardinality of sum-set
92639
Prove that the family of open sets in $\mathbb{R}$ has cardinality equal to $2^{\aleph_0}$
9082
Do sets, whose power sets have the same cardinality, have the same cardinality?
86914
Cardinality of the set of hyperreal numbers
33157
Proof that an infinite subset of $\mathbb{N}$ is countable
41783
Cardinality of the Cartesian Product of Two Equinumerous Infinite Sets
13620
$\omega_2$ is a not countable union of countable sets without AC
40071
What is the cardinality of the set of all topologies on $\mathbb{R}$?
137883
Cardinality of the set of all (real) discontinuous functions
146098
Number of nonempty subsets of a set with $n$ elements
153305
Adding subsets of regular cardinals (Jech p. 226)