Proving 2 sets have the same cardinality
1396
cardinality of all real sequences
142631
Show that A has the same cardinality as $A\setminus\{x,y,z\}$
111032
Proof of Sets involving the Cartesian Product
88982
Prove that for any two sets $A$ and $B$, $A\notin B$ or $B\notin A$
92639
Prove that the family of open sets in $\mathbb{R}$ has cardinality equal to $2^{\aleph_0}$
79568
Cardinality of the set $D$
42603
How can I prove that the cadinality of a set minus a finite number of elements of it is still the same as the original set?
151935
Proving the predicate $\forall n \in \mathbb{N} , n \geq 2$ using the Pigeonhole principle
98518
Cardinality of equivalence relations on N
7785
Cardinality of sum-set
68230
The cardinality of a countable union of sets with less than continuum cardinality
117478
Prove that $\mathbb{R}$ and the interval $(0, \infty)$ have the same cardinality.
9082
Do sets, whose power sets have the same cardinality, have the same cardinality?
149673
Cardinality of an infinite union of finite sets
101669
Cardinality of the Set of all finite subset of $\mathbb{R}$
3636
Are any two uncountable sets similar to each other?
148399
Two sets which contain each other as elements