Continuous homomorphisms from $\mathbb{S}^{1} \to \mathbb{S}^{1}$
12469
$\varphi$ in $\operatorname{Hom}{(S^1, S^1)}$ are of the form $z^n$
5699
The number of ring homomorphisms from $\mathbb{Z}_m$ to $\mathbb{Z}_n$
91222
Isomorphism between $\mathfrak o(4,\mathbb R)$ and $\mathfrak o (3,\mathbb R) \oplus\mathfrak o (3,\mathbb R) $
85175
Continuous Images of $GL_n(\mathbb{R})$
52556
Isomorphism of $S^1$.
52798
Finding counterexamples: bijective continuous functions that are not homeomorphisms
26661
Ring homomorphisms from $\mathbb{Z}_n$ to $\mathbb{Z}_m$
152306
Finding homomorphisms from $\mathbb Z_{12}$ to $\mathbb Z_{6}$.
63836
Show there exists $g:(0,1)\to\mathbb{R}^2$ such that $h\circ g$ constant, $g$ continuously differentiable and $g$ injective
13761
Automorphisms in $\mathbb{Z}_n$
83166
Homeomorphism(topological spaces) version of Cantor–Bernstein–Schroeder theorem
126644
Simple module and homomorphisms
112306
Two manifolds $X$ and $Y$ with two bijective continuous functions from $X$ to $Y$ and $Y$ to $X$, but not homeomorphic
33330
Continuous Functions from $\mathbb{R}$ to $\mathbb{Q}$
90192
Kernel and Image of a group homomorphism
121244
Homomorphisms and automorphisms on polynomial rings
145077
A continuous bijection $f:\mathbb{R}\to \mathbb{R}$ is an homeomorphism?