Building $\mathfrak{so}(1,3)$ reps using $\mathfrak{so}(1,3)\cong \mathfrak{su}(2)\oplus \mathfrak{su}(2)$
32896
Vector spaces for the irreducible representations of the Lorentz Group
98010
Constructing a metric on a Lie Group
11342
Show that conguence $\bmod m\,$ is an equivalence relation
54379
Tensor formula in SU(3) representations
132653
How to show that $\mathfrak{sl}_n(\mathbb{R})$ and $\mathfrak{sl}_n(\mathbb{C})$ are simple?
49806
Prove that $\frac{R/ \ker \phi}{(\ker \phi + J)/ \ker \phi} \cong \frac{S}{\phi(J)}$
85677
Is there a free subgroup of rank 3 in $SO_3$?
66708
Elementary isomorphism between $\operatorname{PSL}(2,5)$ and $A_5$
9140
Show $\operatorname{Aut}(C_2 \times C_2)$ is isomorphic to $S_3=D_6$
129732
What is $\operatorname{Aut}(\mathbb{Z}_2\oplus \mathbb{Z}_2)$?
89805
2-dimensional Lie subgroups of $SO(3)$
114626
Lie Algebra of U(N) and SO(N)
121449
An isomorphism from $GL_{2}(\mathbb{F_{2}})$ to $S_{3}$
120594
$\mathbb Z[i]/ \langle 1+2i \rangle \cong \mathbb Z_5$
53266
Show that $R/I\otimes_R R/J\cong R/(I+J)$
105322
Computing the quotient of SL(2,Z) by its commutator subgroup
74187
$\operatorname{ord}(u)=r,\,\operatorname{ord}(v)=s$ $\,\Rightarrow\,\operatorname{ord}(uv)=rs\,$ if $\,r,s\,$ (co)primes