Surjective function and open mapping
66531
$\|h(x)-h(y)\|\geq 3\|x-y\|$ prove that image of open is open
11813
Injective functions also surjective?
2198
Maps from subsets of $\mathbb{R}^2$ that are either open/closed/continuous
88857
Prove that Gauss map on M is surjective
15095
continuous onto map from $(0,1)\to (0,1]$
80618
Surjective bounded operator in Banach spaces without bounded right-inverse
65971
Double dual mappings
41593
Use of Bijection for computation
145077
A continuous bijection $f:\mathbb{R}\to \mathbb{R}$ is an homeomorphism?
70264
Prove that the inverse image of an open set is open
124847
Is the set of surjective functions from $\mathbb{N}$ to $\mathbb{N}$ uncountable?
5802
Proving the universal mapping property for polynomial rings
134104
Is there a Cantor-Schroder-Bernstein statement about surjective maps?
28798
Proving injection and surjection with functions $F:C^B\to C^A$, $F(f)=f\circ\varphi$, $\varphi: A\to B$
125644
How to check f is surjective
43626
Open Mapping Theorem: counterexample
64583
Number of surjective functions from A to B