Proof of isomorphism between $D_{2n}$ and $D_n \times Z_2$ for $n$ odd
6453
Let $n \geq 1$ be an odd integer. Show that $D_{2n}\cong \mathbb{Z}_2 \times D_n$.
90433
Isomorphisms between $(\mathbb Z_4,+)$ and $(U_5,*)$
78263
Prove $GL_n(\Bbb{R})/SL_n(\Bbb{R}) \cong \Bbb{R}^\times$
75068
subgroups of $\mathbb Z / 2 \mathbb Z \times \mathbb Z / 2 \mathbb Z$
83919
How to show $D_3\oplus D_4$ is not isomorphic to $D_{24}$?
119793
Proving that $D_{12}\cong S_3 \times C_2$
121449
An isomorphism from $GL_{2}(\mathbb{F_{2}})$ to $S_{3}$
139162
Complex number isomorphic to certain $2\times 2$ matrices?
148285
Generator of group $D_n$
89215
How to describe the quotient group $\mathbb{Z} \times \mathbb{Z} / \langle (1, 2) \rangle$
40400
Finding an isomorphism between $\mathbb{Z}[i]/(7)$ and $\mathbb{Z}[\sqrt{-2}]/(7)$
13606
Prove that $K$ is isomorphic to a subfield of the ring of $n\times n$ matrices over $F$.
83001
Easier way to show $(\mathbb{Z}/(n))[x]$ and $\mathbb{Z}[x] / (n)$ are isomorphic
52089
Group of $2n$ elements, $n$ odd, is not simple
138058
Prove that $\mathbb Z_{m}\times\mathbb Z_{n} \cong \mathbb Z_{mn}$ implies $\gcd(m,n)=1$.
81238
Is $O(2)$ really not isomorphic to $SO(2)\times \{-1,1\}$?
107687
How to prove that $U_{2^n}$ is isomorphic as group to $\mathbb Z_2 \times \mathbb Z_{2^{n-2}}$ for $n \ge 3$?