Every continuous homomorphism $S^1 \rightarrow S^1$ is of the form $x \mapsto x^n$ for $n \in \mathbb Z$
12469
$\varphi$ in $\operatorname{Hom}{(S^1, S^1)}$ are of the form $z^n$
84114
Does there exist a surjective homomorphism from $(\mathbb R,+)$ to $(\mathbb Q,+)$ ?
13761
Automorphisms in $\mathbb{Z}_n$
121886
Proving image of $f:D^n\rightarrow \mathbb{R}^n \;$ contains $\;D^n$
100736
Why every map $f : S^n \to T^n (n>1)$ has topological degree zero?
157378
On an injective ring homomorphism from the ring of continuous functions to the ring of differentiable functions
30455
Show that any continuous $f:[0,1] \rightarrow [0,1]$ has a fixed point $\zeta$
66180
Homomorphism between compact Hausdorff spaces.
33455
Question on group homomorphisms involving the standard Z-basis
112131
Characterizing all ring homomorphisms $C[0,1]\to\mathbb{R}$.
151719
Connected set in $\mathbb{S}^1$
92303
Homology of $S^1 \times (S^1 \vee S^1)$
120968
Isomorphism of stabilizer over $S_n$ to $S_{n-1}$
89415
Number of homomorphisms from $(\mathbb Q^+ , \,\cdot\,)$ to $(\mathbb Z_n , +)$
60485
Show that $S^1 - \lbrace (1,0)\rbrace$ is homeomorphic to the open interval $(0,1)$
154837
mapping properties of $(1−z)^i$
13717
Homomorphisms from $S_4$ to $\mathbb Z_2$