bijection between $\mathbb{N}$ and $\mathbb{N}\times\mathbb{N}$
39231
Construct a bijection between $\mathbb{Z}^+\times \mathbb{Z}^+$ and $\mathbb{Z}^+$
132311
T$\mathbb{S}^{n} \times \mathbb{R}$ is diffeomorphic to $\mathbb{S}^{n}\times \mathbb{R}^{n+1}$
146436
Cardinality of the set of bijective functions on $\mathbb{N}$?
78847
Bijection between Prime numbers and Natural numbers
117793
Finding a function $\mathbb{N} \to \mathbb{N}$ that is surjective but not injective.
127233
Cardinality of order types in $\mathbb{N}$
32362
Detail in bijection between Inn(G) and G/Z(G)?
44717
Does there exist a bijective $f:\mathbb{N} \to \mathbb{N}$ such that $\sum f(n)/n^2$ converges?
23125
Prove that there is a bijection between the set of all subsets of $X$, $P(X)$, and the set of functions from $X$ to $\{0,1\}$.
64130
Prove that $\mathbb{Q}^{\times}$ not isomorphic to $\mathbb{Z}^{n}$
106884
Is there a continuous bijection between an interval $[0,1]$ and a square: $[0,1] \times [0,1]$?
148731
Constructing a bijection between $[a,b)$ to $(0,1)$
133699
Proving that there is a bijection between $A$ and $B$.
16559
Difference between $\mathbb{Z}/n\mathbb{Z}$ and $\mathbb{Z}_n$
23464
How to find a explicit bijection for some $f:A\times B \rightarrow B \times A$
110569
Does anyone know a closed-form expression for a bijection between $\mathbb{N}^k$ and $\mathbb{N}$?
121685
Is there a bijection of the natural numbers which swaps $\frac{1}{n}$-summable subsets with $\frac{1}{\sqrt{n}}$-summable subsets?