Cardinality of the real numbers
62755
The simplest way of proving that $|\mathcal{P}(\mathbb{N})| = |\mathbb{R}| = c$
39880
Cardinality of Orderings of $\mathbb{R}$
40071
What is the cardinality of the set of all topologies on $\mathbb{R}$?
25788
Prove that $i^i$ is a real number
108957
Cardinality of a totally ordered union
70164
Proof exercise that the cardinal number of a set in $\mathbb R^2$ is $\frak c$
60775
Why are integers subset of reals?
89167
Cardinality of equivalence relations in $\mathbb{N}$
127233
Cardinality of order types in $\mathbb{N}$
144735
Possible cardinality of power sets
158671
Cardinality of a set that consists of all existing cardinalities
118390
Symbol for the cardinality of the continuum
65768
What is the cardinality of the set of the empty set?
136069
Is there a simple formula for the cardinality of $\{A\subseteq\kappa\mid |A|\leq\lambda\}$ when $\lambda\leq\kappa$?
31318
Cardinality of cartesian square
7785
Cardinality of sum-set
12436
The cardinality of the set of all finite subsets of an infinite set