Is it true that every injective function must be surjective?
11813
Injective functions also surjective?
138481
$f(x)=x/1$ is not injective?
28798
Proving injection and surjection with functions $F:C^B\to C^A$, $F(f)=f\circ\varphi$, $\varphi: A\to B$
155266
Is $\exp:\overline{\mathbb{M}}_n\to\mathbb{M}_n$ injective?
45380
Surjectivity implies injectivity and conversely
6023
Surjectivity of Composition of Surjective Functions
63146
Proof of properties of injective and surjective functions.
2072
Demonstrate that if $f$ is surjective then $X = f(f^{-1}(X))$
152438
Is the composition of two injective functions injective?
40566
Counting surjective functions
107400
Can there be an injective function whose derivative is equivalent to its inverse function?
111689
Surjective, but not injective endomorphism
117502
Proving that a certain continuous function is surjective.
642
Does a surjective ring homomorphism have to be surjective on the unit groups?
116732
Proving that a continuous map is surjective
77944
Injective functions with intermediate-value property are continuous. Better proof?
146436
Cardinality of the set of bijective functions on $\mathbb{N}$?