Cardinal of a set of numbers: naturals, integers, rationals and irrationals
86988
Cardinality of the Irrationals
127233
Cardinality of order types in $\mathbb{N}$
140140
An identity which applies to all of the natural numbers
103717
Topological Property of the Set of Integers
111954
Computing the cardinality of a combinatorial set
16553
Cardinality of the set of all total orders on $\Bbb{N}$
34710
Cardinality of Irrational Numbers
156660
The set of all strictly increasing sequences of natural numbers
30105
Multiples of an irrational number forming a dense subset
7785
Cardinality of sum-set
117047
exponentiation of cardinal number
22232
Proving that cardinality of the reals = cardinality of $[0,1]$
12436
The cardinality of the set of all finite subsets of an infinite set
45878
Elementary Set Theory: Ordinals, Well Orderings and Isomorphisms
83037
Applying Zorn's Lemma to natural numbers
137883
Cardinality of the set of all (real) discontinuous functions
20085
What's the cardinality of all sequences with coefficients in an infinite set?