A bijection from N^2 to N that is not Cantor's pairing function
49833
Simple bijection $\mathbb N_0 \times \mathbb N_0 \to \mathbb N_0$
40566
Counting surjective functions
26569
Counting binary operations on a set with $n$ elements
21707
Constructing a Bijective function via an injective and surjective one.
64140
Find a bijection from $\mathbb R$ to $\mathbb R-\mathbb N$
20706
Non-existence of a Surjective Function from a Set to Its Subsets (Cantor's theorem)
5375
Is there a bijective function mapping Natural numbers to Natural numbers, other than $f(n) = n$?
117793
Finding a function $\mathbb{N} \to \mathbb{N}$ that is surjective but not injective.
32362
Detail in bijection between Inn(G) and G/Z(G)?
119549
Prove the even integers are countable (by explicitly giving a bijection $\mathbb{N} \to E$)
38257
Continuous bijection from $(0,1)$ to $[0,1]$
139826
arbitrary large finite sums of an uncountable set.
32340
Continuous bijections and their inverses
136538
How can I show that a bijection between $[0,1)$ and $(0,1)$ cannot be continuous?
30021
Bijection between set of all binary sequences and power set of $\mathbb N$.
64866
Proving a Composition of Functions is Bijective
13453
Bijection map from a set of subgroup to another set of subgroup under some condition.