How to prove that this function is surjective?
9021
An infinite subset of a countable set is countable
45710
Finishing a proof: $f$ is injective if and only if it has a left inverse
60348
How do I prove $F(a)=F(a^2)?$
63453
A proof of the fact that the Fourier transform is not surjective from $\mathcal{L}^1(\mathbb{R})$ to $C_0( \mathbb{R})$
16610
Surjectivity of a map from a space to itself
105455
Prove that "injective function $f:X\to Y$ exists" and "surjective function $g:Y\to X$ exists" is logically equivalent.
145875
Inverse of a bijection f is equal to its derivative
124374
A bijective function between a square and its side
157925
How to prove that the implicit function theorem implies the inverse function theorem?
49953
Proving that a function from $N\times N$ to $N$ is bijective.
46748
If $g \circ f$ is surjective, show that $f$ does not have to be surjective?
117502
Proving that a certain continuous function is surjective.
72251
$g\circ f$ is Surjective and $g$ is Injective then Prove that $f$ is surjective
35953
Prove that a function is not injective
82001
How to prove the function is a constant
52348
Counting the number of surjections.
157268
Proving a bijection with absolute value