Cardinal of an open interval
138283
$|(a,b)| = |\Bbb R|$ ? Cardinality of any open interval
99464
Proof Concerning Indexed family of Sets and Intervals
272
Cantor Sets/nonempty/cardinality
124100
Write the closed interval $[a,b]$ as the union of semi-intervals.
126212
Proving uniform continuity on an interval
153934
How to prove that a set R\Z is open
62542
Why is the empty set considered an interval?
38581
Construct a Borel set on R such that it intersect every open interval with non-zero non-"full" measure
127678
A partition of the unit interval into uncountably many dense uncountable subsets
33014
Bijection between an open and a closed interval
106325
Question about Cardinality
105425
The intervals $(2,4)$ and $(-1,17)$ have the same cardinality
156783
$\mathbb R$ has the same cardinality of any interval
9696
The interval [0,1] andd [3,5] are equivalent. Is my proof correct?
13398
Prove that the interval $(0, 1)$ and the Cartesian product $(0, 1) \times (0, 1)$ have the same cardinality
123897
Sum of two open sets is open?
126259
Minimum of a function on an open interval