Comparing cardinality of two sets
13273
Cardinality of the set of all real functions of real variable
15733
Show that the cardinality of $\mathbb N$ is the same as the cardinality of $\mathbb N \times \mathbb N$
32912
Getting the difference between two sets
79974
The cardinality of Lebesgue sets
108922
Cardinality and infinite sets: naturals, integers, rationals, bijections
136069
Is there a simple formula for the cardinality of $\{A\subseteq\kappa\mid |A|\leq\lambda\}$ when $\lambda\leq\kappa$?
142886
Find set with maximal cardinality given constraints
102515
Counting functions between two sets
68230
The cardinality of a countable union of sets with less than continuum cardinality
93330
Cardinality of all cardinalities
118595
Proving that a set is countable by finding a bijection
121366
Intervals and cardinality
62180
Best way to find the intersection of multiple sets?
122814
Finite Sets, Equal Cardinality, Injective $\iff$ Surjective.
5840
divides, not divides and cardinalities
138283
$|(a,b)| = |\Bbb R|$ ? Cardinality of any open interval
114262
Find the cardinality of the following set $S_n=\{(x,y)|x^2+y^2=n, \text{where }x,y,n \in \mathbb Z\text{ and }n\geq0 \}$