Proving that $f: N\times N \rightarrow N$ is surjective
93964
Proving that $f$ is a bijection from $N$x$N$ to $N$.
61103
Prove that $\mathbb{|Q| = |Q\times Q|}$
21391
Proving Functions are Surjective
116732
Proving that a continuous map is surjective
40566
Counting surjective functions
45380
Surjectivity implies injectivity and conversely
93040
$f$ is surjective iff it has a right inverse: using the axiom of choice and errors in ProofWiki
46748
If $g \circ f$ is surjective, show that $f$ does not have to be surjective?
99662
proving than every $2\times 2$ is similar to a united form
121886
Proving image of $f:D^n\rightarrow \mathbb{R}^n \;$ contains $\;D^n$
16092
How to prove that the composition of two surjective functions is surjective
5635
How to prove that the Frobenius endomorphism is surjective?
61
Calculating the total number of surjective functions
94571
How can we prove that $N_G(H)=H$ implies $N_{f(G)}(f(H))=f(H)$
80916
How to prove that if $A\subseteq A\times A$, then $A=\varnothing$?
13606
Prove that $K$ is isomorphic to a subfield of the ring of $n\times n$ matrices over $F$.
70912
If $g\circ f$ is injective and $f$ is surjective then $g$ is injective