Is this set countable? (intervals in $\mathbb{R}$)
36184
Countability of disjoint intervals
133266
If $(X, \mathcal{T})$ has a countable subbasis, then it has a countable basis
66239
Verifying that a certain collection of intervals of $\mathbb R$ forms a topology
11405
If a nonempty set of real numbers is open and closed, is it $\mathbb{R}$? Why/Why not?
272
Cantor Sets/nonempty/cardinality
40071
What is the cardinality of the set of all topologies on $\mathbb{R}$?
41192
Neatest proof that set of finite subsets is countable?
128437
How to prove that a finite set is countable
105445
Are the rationals a closed or open set in $\mathbb{R}$?
140300
Does the interval $[0,1]$ contains more real numbers than $(0,2)$?
99464
Proof Concerning Indexed family of Sets and Intervals
156783
$\mathbb R$ has the same cardinality of any interval
42095
Existence in ZF of a set with countable power set
103769
The Cartesian product of a finite number of countable sets is countable
623
variation of a function over countable intervals
73927
Is $\mathbb{R}$ a subset of $\mathbb{R}^2$?
39880
Cardinality of Orderings of $\mathbb{R}$