Bijection between $\mathbb N^2$ and $\mathbb N$
31391
bijection between $\mathbb{N}$ and $\mathbb{N}\times\mathbb{N}$
38549
$\mathbb{Q}(\sqrt{n}) \cong \mathbb{Q}(\sqrt{m})$ iff $n=m$
23464
How to find a explicit bijection for some $f:A\times B \rightarrow B \times A$
51695
Finding all homomorphisms between $\mathbb{Z}/m\mathbb{Z}$ and $\mathbb{Z}/n\mathbb{Z}$
102299
Bijection between $\mathbb{R}^n$ and $\mathbb{R}^m$
33014
Bijection between an open and a closed interval
89167
Cardinality of equivalence relations in $\mathbb{N}$
41359
Constructing a bijection
97878
Are there uncountably many surjections from $\mathbb N$ to $\mathbb N$?
16559
Difference between $\mathbb{Z}/n\mathbb{Z}$ and $\mathbb{Z}_n$
133699
Proving that there is a bijection between $A$ and $B$.
88051
$\mathbb R = X^2$ as a Cartesian product
39231
Construct a bijection between $\mathbb{Z}^+\times \mathbb{Z}^+$ and $\mathbb{Z}^+$
26661
Ring homomorphisms from $\mathbb{Z}_n$ to $\mathbb{Z}_m$
90566
There exists surjections from A onto B and vice versa, and there is no bijection between the sets?
92211
When are $\mathbb Z_m$ and $\mathbb Z_n$ homomorphic?
57967
Difference between $\mathbb C$ and $\mathbb R^2$