Bijection between $\mathbb{Z} \longmapsto \mathbb{R}$
2269
Proof that the real numbers are countable: Help with why this is wrong
5803
Produce an explicit bijection between rationals and naturals?
34260
Injective function from $\mathbb{R}^2$ to $\mathbb{R}$?
109643
Prove that every isometry on $\mathbb{R}^2$ is bijective
34700
Proving that the matrix exponential map is surjective onto the general linear group
94165
Why is a map to a smaller dimensional space not injective?
119702
Showing a bijection between the set of ringhomomorphisms $\mathbb{Z}[i] \to R$ and the set of $x \in R$ for which $x^2+1=0$
31244
Is this a correct bijection between $(0,1]$ and $[0,1]$?
110569
Does anyone know a closed-form expression for a bijection between $\mathbb{N}^k$ and $\mathbb{N}$?
16610
Surjectivity of a map from a space to itself
33014
Bijection between an open and a closed interval
84114
Does there exist a surjective homomorphism from $(\mathbb R,+)$ to $(\mathbb Q,+)$ ?
53168
Surjective, Injective, Bijective Functions from $\mathbb Z$ to itself
37565
Bijection from finite (closed) segment of real line to whole real line
127365
Question on showing a bijection between $\pi_1(X,x_0)$ and $[S^1, X]$ when X is path connected.
72644
Continuous injective map $f:\mathbb{R}^3 \to \mathbb{R}$?
57269
A special bijection between $\mathbb{R}\times \mathbb{R}$ and $\mathbb{R}$