Proving a Galois Group is isomorphic to $D_4$
4996
Proving $Gal(K/\mathbb{Q})$ is $D_4$.
11731
Normal subgroups of $S_4$
41688
An elementary problem in Group Theory: the unique noncyclic group of order 4
73652
Exhibiting an isomorphism between two finite fields
23279
Group Theory Isomorphism
146969
Proving that every group of order $4$ is isomorphic to $\Bbb Z_4$ or $\Bbb Z^*_8$
116628
Example of Galois extension whose Galois group is $A_4$
53331
$\mathbb{Q}(\sqrt2, \sqrt3)$ is not isomorphic to $\mathbb{Q}(\sqrt[4]2)$
157915
Isomorphism between the group $(\mathbb Z[x], +)$ and $(\mathbb Q_{>0}, .)$
61732
Prove any group with 3 elements is isomorphic to $\mathbb{Z}_3$
93169
Show that $(\mathbb Z[x],+)$ and $(\mathbb Q_{>0},\cdot)$ are isomorphic groups
6171
Isomorphism between $\Bbb{Z}[\sqrt{d}]$ and a quotient of $\Bbb{Z}[X].$
74964
Showing Galois Group is Abelian
8602
Galois Group of $(x^2-p_1)\cdots(x^2-p_n)$
28576
Galois Groups are isomorphic to subgroups of symmetric groups.
9129
Show that $\mathbb{Q}(\zeta_n)$ is Galois over $\mathbb{Q}$ and $Gal(\mathbb{Q}(\zeta_n)/\mathbb{Q}))\cong \mathbb{Z_n}^*$
16804
Prove whether or not a subgroup is normal in the dihedral group $D_4$