find cardinality of A
109968
Let $X= \{ A \subset \mathbb{N} : \mathbb{N} \backslash A \text{ is finite}\}$. What is the cardinality of $X$? Prove it.
82947
Undecidable cardinality
114262
Find the cardinality of the following set $S_n=\{(x,y)|x^2+y^2=n, \text{where }x,y,n \in \mathbb Z\text{ and }n\geq0 \}$
144735
Possible cardinality of power sets
108922
Cardinality and infinite sets: naturals, integers, rationals, bijections
34138
Cardinal number subtraction
27704
Cardinality of quotient ring $\mathbb{Z_6}[X]/(2X+4)$
152342
$x_1+x_2+\cdots+x_n\leq M$: Cardinality of Solution Set is $C(M+n, n)$
117047
exponentiation of cardinal number
73850
Cardinality of set of functions
152518
Proof that the set of all possible curves is of cardinality $\aleph_2$?
158671
Cardinality of a set that consists of all existing cardinalities
108957
Cardinality of a totally ordered union
63489
The class of cardinal numbers is well ordered
79974
The cardinality of Lebesgue sets
34710
Cardinality of Irrational Numbers
20085
What's the cardinality of all sequences with coefficients in an infinite set?