A bijective map from $\bf N \times N$ to $\bf N$
67644
How does one get the formula for this bijection from $\mathbb{N}\times\mathbb{N}$ onto $\mathbb{N}$?
124847
Is the set of surjective functions from $\mathbb{N}$ to $\mathbb{N}$ uncountable?
154754
Is $O_n$ isomorphic to $SO_n \times \{\pm I\}$?
31391
bijection between $\mathbb{N}$ and $\mathbb{N}\times\mathbb{N}$
27265
Continuously differentiable map from $\mathbb{R}^{m+n}$ to $\mathbb{R}^n$
133699
Proving that there is a bijection between $A$ and $B$.
130137
How to define a Bijection between $(A^B)^C$ and $A^{B \times C}$
13453
Bijection map from a set of subgroup to another set of subgroup under some condition.
72642
Continuous bijection from $(a,b) \to S^1$?
20199
Find a surjective function $f:\mathbb{N}\to \mathbb{Q}$
148668
How to show $A\times (B\cup C) = (A\times B)\cup (A\times C)$
6161
The cartesian product $\mathbb{N} \times \mathbb{N}$ is countable
26169
Function $f: \mathbb{R} \to \mathbb{R}$ that takes each value in $\mathbb{R}$ three times
61103
Prove that $\mathbb{|Q| = |Q\times Q|}$
146436
Cardinality of the set of bijective functions on $\mathbb{N}$?
124374
A bijective function between a square and its side
16610
Surjectivity of a map from a space to itself