Is $D_{2^{n+1}}/Z_2\cong D_{2^n}$?
37928
Isomorphism between $D_{2n}/Z(D_{2n})$ and $D_n$
123698
Can $2^k + 2^j$ be expressed as $2^n$?
133636
Is $\mathbb Z[X]/(X^2-1)$ a domain?
122581
Prove or disprove that $G_1/H_1 \cong G_2/H_2$
120594
$\mathbb Z[i]/ \langle 1+2i \rangle \cong \mathbb Z_5$
118299
Show that $(\mathbb{Z}[x]/(x^{n+1}))^{\times}\cong \mathbb{Z}/2\mathbb{Z}\times\Pi_{i=1}^n\mathbb{Z}$
76100
Showing that $\left\langle a,b \mid abab^{-1}\right\rangle \cong \pi_1(K) \cong \left\langle c,d \mid c^2 d^2 \right\rangle$
103854
Showing that $Q_n=D_n+D_{n-1}$
105363
$\mathbb Z^n/\langle (a,...,a) \rangle \cong \mathbb Z^{n-1} \oplus \mathbb Z/\langle a \rangle$
112631
Prove that if $d$ divides $n$, then $2^d -1$ divides $2^n -1$
121880
How to show that $|D_{2n}| = 2n$ via the presentation?
9129
Show that $\mathbb{Q}(\zeta_n)$ is Galois over $\mathbb{Q}$ and $Gal(\mathbb{Q}(\zeta_n)/\mathbb{Q}))\cong \mathbb{Z_n}^*$
120495
Does this correctly interpret the "$\cong$" between groups as "$=$" between sets?
35660
Elements of order 2 in $D_{2n}$
148330
Induction Proof for $F_{2n} = F^2_{n+1} - F^2_{n-1}$
22783
Is the set $Z_n = \{ 0, 1, . . . , n-1 \}$ for $n ≥ 1$ is a group under addition modulo n?
101164
Show that $B \cong \mathbb Z /2\mathbb Z$ for a Boolean field B