$\mathbb{Z}[i] /\langle 3+3 i\rangle \cong \mathbb{F}_{3}[X] /\left\langle X^{2}+1\right\rangle \times \mathbb{F}_{2} $
9794
Quotient ring of Gaussian integers $\mathbb{Z}[i]/(a+bi)$ when $a$ and $b$ are NOT coprime
31919
What can we say about the inner product $\langle f(t),f'(t) \rangle$?
137285
Prove $\mathbb{Z}_2 \times \mathbb{Z}_2$ is not isomorphic to $\mathbb{Z}_4$
23517
Presentation $\langle x,y,z\mid xyx^{-1}y^{-2},yzy^{-1}z^{-2},zxz^{-1}x^{-2}\rangle$ of group equal to trivial group
120035
Pattern in Isomorphisms between $\mathbb Z_m \times \mathbb Z_n$ and $\mathbb Z_{mn}$
94579
$\mathbb{Q}[x,y]/\langle x^2+y^2-1 \rangle$ is an integral domain, and its field of fractions is isomorphic to $\mathbb Q(t)$
127047
How to show that $\sum_{i=1}^n | \langle f, f_i\rangle |^2 \leq \Vert f \Vert^2$
9140
Show $\operatorname{Aut}(C_2 \times C_2)$ is isomorphic to $S_3=D_6$
108044
Isomorphic extensions of $\mathbb Z_3$ by $\mathbb Z_3 \times \mathbb Z_3$ which are not equivalent
98284
show $\Bbb Z_6 \cong \Bbb Z_3 \times \Bbb Z_2 $.
94296
Classifying the factor group $(\mathbb{Z} \times \mathbb{Z})/\langle (2, 2) \rangle$
78263
Prove $GL_n(\Bbb{R})/SL_n(\Bbb{R}) \cong \Bbb{R}^\times$
119793
Proving that $D_{12}\cong S_3 \times C_2$
124230
What is $\operatorname{Hom}_\mathbb{Z}(\mathbb{Q}/\mathbb{Z},\mathbb{Q}/\mathbb{Z})$?
47522
group generators of $(\mathbb Z_{17}-\{0\},\times)$
108775
Identify the ring $\mathbb {Z}[i]/(2 + i) $
98352
If $k|n$, then $D_{2n}/\langle{r^k}\rangle\cong D_{2k}$