Lie algebra of 2 by 2 matrces that are upper triangular and their characteristics that define them
101229
Lie algebra of $\left(\begin{smallmatrix}a & b\\ & a^2\end{smallmatrix}\right )$ in $GL_2(\mathbb{R})$
115414
Lie Algebra of $SL_n(\mathbb H)$
111814
Precise connection between complexification of $\mathfrak{su}(2)$, $\mathfrak{so}(1,3)$ and $\mathfrak{sl}(2, \mathbb{C})$
83483
Is there a nice way to classify the ideals of the ring of lower triangular matrices?
33423
Decomposition of semisimple Lie algebra via its roots
82637
Does there exist a non-trivial, associative Lie algebra?
144145
Symmetric $3\times 3$ Matrices - Base matrix
153426
Is the radical of a Lie algebra preserved by all of its derivations?
132653
How to show that $\mathfrak{sl}_n(\mathbb{R})$ and $\mathfrak{sl}_n(\mathbb{C})$ are simple?
39537
Determinant of a block upper triangular matrix
68001
Semisimple Lie algebras are perfect.
84677
An Explicit Isomorphism Between the Three Dimensional Orthogonal Lie Algebra and the Special Linear Lie Algebra of Dimension $3$
112690
Lie Group Decomposition as Semidirect Product of Connected and Discrete Groups
18687
First and second homotopy groups of a connected Lie group
43303
Which Lie groups have Lie algebras admitting an Ad-invariant inner product?
89805
2-dimensional Lie subgroups of $SO(3)$
151240
Short way for upper triangularization