Root system of Lie algebra: right angle => not simple?
33423
Decomposition of semisimple Lie algebra via its roots
153480
Roots of a characteristic equation. Can Mathematica solve it?
108975
The simple modules of upper triangular matrix algebras.
115414
Lie Algebra of $SL_n(\mathbb H)$
93546
Galois group and the Quaternion group
111883
Representations of a product of Lie groups
24131
How to visualise the derived series of the Lie algebra $\mathfrak{u}(n,\mathbb{C})$?
153707
Is the Lie bracket of two vector fields well defined?
55493
Showing that the path-connected component of the identity matrix in a subgroup of $GL_n(\Bbb R)$ is a normal subgroup
44629
Why Lie algebras of type $B_2$ and $C_2$ are isomorphic?
77722
Lie algebra of affine linear maps
20479
Radical of a Lie algebra bracket itself
23535
Describing the Lie algebra structure of a semi-direct product of Lie groups
35248
Getting started with Lie Groups
147886
Proof of the angle sum identity for $\sin$
41312
Question on primitive roots of unity
132653
How to show that $\mathfrak{sl}_n(\mathbb{R})$ and $\mathfrak{sl}_n(\mathbb{C})$ are simple?