The cardinality of the even numbers is half of the cardinality of the natural numbers?
39740
What is larger -- the set of all positive even numbers, or the set of all positive integers?
152547
Is the sum of all natural numbers countable?
69166
Cardinality of $\mathbb{R}$ and $\mathbb{R}^2$
83518
Proving Two sets have same cardinality
136735
Why is the cardinality of set S is 3^n, where S is the collection of all ordered pairs of disjoint subset of {1,2,3,...,n} where n is non negative.
122947
What is the cardinality of the set of infinite cardinalities?
144735
Possible cardinality of power sets
65768
What is the cardinality of the set of the empty set?
10909
$|A \cup B| = \mathfrak{c}$, then $A$ or $B$ has cardinality $\mathfrak{c}$.
9082
Do sets, whose power sets have the same cardinality, have the same cardinality?
39880
Cardinality of Orderings of $\mathbb{R}$
117047
exponentiation of cardinal number
31318
Cardinality of cartesian square
12436
The cardinality of the set of all finite subsets of an infinite set
1396
cardinality of all real sequences
15733
Show that the cardinality of $\mathbb N$ is the same as the cardinality of $\mathbb N \times \mathbb N$
28942
About Math notation: the set of the first $n$ natural numbers