The cardinality of some sets
3902
Does $k+\aleph_0=\mathfrak{c}$ imply $k=\mathfrak{c}$ without the Axiom of Choice?
121366
Intervals and cardinality
68230
The cardinality of a countable union of sets with less than continuum cardinality
62687
Proving Cardinality of Cosets in Abstract Algebra
69166
Cardinality of $\mathbb{R}$ and $\mathbb{R}^2$
109968
Let $X= \{ A \subset \mathbb{N} : \mathbb{N} \backslash A \text{ is finite}\}$. What is the cardinality of $X$? Prove it.
117047
exponentiation of cardinal number
10839
Problem in Cardinality and Order
136069
Is there a simple formula for the cardinality of $\{A\subseteq\kappa\mid |A|\leq\lambda\}$ when $\lambda\leq\kappa$?
16553
Cardinality of the set of all total orders on $\Bbb{N}$
34710
Cardinality of Irrational Numbers
35043
Cardinality of a set A is strictly less than the cardinality of the power set of A
144735
Possible cardinality of power sets
117658
A set with n elements has 2^n subsets
272
Cantor Sets/nonempty/cardinality
98518
Cardinality of equivalence relations on N
146098
Number of nonempty subsets of a set with $n$ elements