The Cardinality of $(a,b)$ and $\Bbb{R}$
94363
Prove: Any open interval has the same cardinality of $\Bbb R$ (without using trigonometric functions)
85099
How many subsets of $\mathbb{N}$ have the same cardinality as $\mathbb{N}$?
41783
Cardinality of the Cartesian Product of Two Equinumerous Infinite Sets
50880
Expressing $\Bbb N$ as an infinite union of disjoint infinite subsets.
13273
Cardinality of the set of all real functions of real variable
70164
Proof exercise that the cardinal number of a set in $\mathbb R^2$ is $\frak c$
73850
Cardinality of set of functions
84198
Step in Proof of Cardinality of Product of two Groups
79974
The cardinality of Lebesgue sets
9651
Cardinality of cartesian product of an infinite set with N
40071
What is the cardinality of the set of all topologies on $\mathbb{R}$?
10839
Problem in Cardinality and Order
12436
The cardinality of the set of all finite subsets of an infinite set
130381
bijection from $(a,b)$ to $\Bbb R$
117478
Prove that $\mathbb{R}$ and the interval $(0, \infty)$ have the same cardinality.
123847
Cardinality of $GL_n(K)$ when $K$ is finite
15733
Show that the cardinality of $\mathbb N$ is the same as the cardinality of $\mathbb N \times \mathbb N$