Prove that set of all finite subsets of N with n elements is denumerable
41661
Show that the set of all finite subsets of $\mathbb{N}$ is countable.
147013
Subset of a finite set is finite
75966
Prove that if $A$ is a set with $m$ elements, $B$ is a set with $n$ elements, and $A \cap B = \emptyset$, then $A \cup B$ has $m+n$ elements.
41192
Neatest proof that set of finite subsets is countable?
151928
How to prove that $N\setminus A$ is finite?
66301
The cardinality of the set of countably infinite subsets of an infinite set
33157
Proof that an infinite subset of $\mathbb{N}$ is countable
54406
Is $\mathbb Q \times \mathbb Q $ a denumerable set?
113668
Uncountable chain of subsets of $\mathbb N$
113922
Proof that the intersection of any finite number of convex sets is a convex set
122828
Proof that TREE(n) where n >= 3 is finite?
4776
Prove that the power set of an $n$-element set contains $2^n$ elements
31969
Partition of N into infinite number of infinite disjoint sets?
92249
Every finite set contains its supremum: proof improvement.
104855
Prove that $N \subset Z(G)$
117862
Number of partitions of an $n$-element set into $k$ classes
10180
How to prove that this set is closed?