Show that $\mathfrak{so}(4) \simeq \mathfrak{su}(2) \oplus \mathfrak{su}(2)$
125980
Isomorphic Lie Algebra $so(4)$ and $su(2) \times su(2)$
85752
Show that $M=\frac{\mathbb{Z}^3}{\langle (3,3,1),(2,2,2)\rangle}$ is isomorphic to $\mathbb{Z} \oplus \mathbb{Z}_4$ as $\mathbb{Z}$-modules
52642
Show that $\text{C}/c \cong (c/(\text{C}^{\text{op}}))^{\text{op}}$
51898
Show that $\operatorname{Hom}_{R} (R,M) \cong M$
24131
How to visualise the derived series of the Lie algebra $\mathfrak{u}(n,\mathbb{C})$?
77742
Queries about rotational groups $\mathrm{SO}(3)$ and $\mathrm{SU}(2)$ in QM
141258
Why does $M \mathbin{\otimes_R} N \cong M_\mathfrak{p} \mathbin{\otimes_{R_\mathfrak{p}}} N$?
142038
Finding the number of elements of order two in the symmetric group $S_4$
127047
How to show that $\sum_{i=1}^n | \langle f, f_i\rangle |^2 \leq \Vert f \Vert^2$
14895
Reference for the subgroup structure of $\rm{PSL}_2(q)$
134840
Generators and relations for $\text{PSL}(2, \mathbb{F}_q)$
45179
When does the isomorphism $G\simeq \ker(\phi)\times \operatorname{im}(\phi)$? hold?
57434
$SL_2(\mathbb Z_3)/Z(SL_2(\mathbb Z_3)) \cong A_4$
36090
$TT^*=T^2$, show that $T$ is self-adjoint
65873
A proof for Atiyah-Macdonald Exercise I.21.iii
95686
$Lie(G \times H)\cong Lie(G)\oplus Lie(H)$
127291
Show that $\left( \frac{q}{p} \right) \equiv q^{(p-1) / 2} \mod p$, where $\left( \frac{q}{p} \right)$ is the Legendre Symbol