Cardinality of any two sets is comparable: proof using Zorn's lemma
39708
Proving $(A\le B)\vee (B\le A)$ for sets $A$ and $B$
101669
Cardinality of the Set of all finite subset of $\mathbb{R}$
3636
Are any two uncountable sets similar to each other?
96845
Question: Compare the cardinality between the sets $\Bbb R$ and $\Bbb N^{\Bbb N}$
41783
Cardinality of the Cartesian Product of Two Equinumerous Infinite Sets
65768
What is the cardinality of the set of the empty set?
144787
Show that the set of all infinite subsets of $\mathbb{N}$ has cardinality greater than $\mathbb{N}$
122947
What is the cardinality of the set of infinite cardinalities?
118595
Proving that a set is countable by finding a bijection
93330
Cardinality of all cardinalities
45878
Elementary Set Theory: Ordinals, Well Orderings and Isomorphisms
108957
Cardinality of a totally ordered union
69337
Zorn's Lemma And Axiom of Choice
138283
$|(a,b)| = |\Bbb R|$ ? Cardinality of any open interval
151935
Proving the predicate $\forall n \in \mathbb{N} , n \geq 2$ using the Pigeonhole principle
144735
Possible cardinality of power sets
82628
Cardinality of a set of closed intervals