$3$-regular graphs and isomorphisms
138226
Finding All n-regular graphs on m vertices
121244
Homomorphisms and automorphisms on polynomial rings
124140
Quick way to find the number of the group homomorphisms $\phi:{\bf Z}_3\to{\bf Z}_6$?
136083
Show that $\sigma\circ\phi : G_1 \to G_3$ is an isomorphism
110018
Conjugacy classes in $A_n$.
45179
When does the isomorphism $G\simeq \ker(\phi)\times \operatorname{im}(\phi)$? hold?
129845
Prove that $T$ is a subgraph of $G$
43645
Show that $G/H\cong S_3$
19305
How to tell whether two graphs are isomorphic?
53924
What is the smallest $n$ for which loopless graphs contain non-isomorphic $n$-vertex graphs with the same degree sequence?
1558
Number of homomorphisms between two cyclic groups.
109596
Isomorphism from $\mathrm{Aut}(\mathbb{Z}/2\mathbb{Z}\times \mathbb{Z}/2\mathbb{Z})$ to $S_3$
46841
When is a graph isomorphic to the source?
26251
Prove self-complementarity of regular graph with given order.
120288
Semigroup isomorphism
117685
Prove that a bipartite planar graph has a vertex of degree at most 3
51002
Regular graph (Homework)