Bijection function from non-negative integers to integers
141227
How to show the integers have same cardinality as the natural numbers?
82003
Bijection between sets of ideals
130381
bijection from $(a,b)$ to $\Bbb R$
109710
Bijection between $\mathbb N \times \mathbb N$ and $\mathbb N$
117793
Finding a function $\mathbb{N} \to \mathbb{N}$ that is surjective but not injective.
149489
30 positive integers
93964
Proving that $f$ is a bijection from $N$x$N$ to $N$.
10850
Are all functions that have an inverse bijective functions?
5803
Produce an explicit bijection between rationals and naturals?
132644
Convert a Pair of Integers to a Integer, Optimally?
51408
Converting numbers to integers
73221
How can I form a bijection between $\mathcal P(A)$ and $2^A$.
111477
Specify a bijection from [0,1] to (0,1].
128966
Explicit bijection between $\Bbb R$ and permutations of $\Bbb N$
34260
Injective function from $\mathbb{R}^2$ to $\mathbb{R}$?
96202
Prove composition of bijections is bijection
124847
Is the set of surjective functions from $\mathbb{N}$ to $\mathbb{N}$ uncountable?