Normalizer of Upper Triangular Matrices with diagonal entries 1 in $GL_n(\mathbb{F}_p)$
74411
Normalizer of Unipotent subgroup in General Linear group
79739
Block diagonal matrix diagonalizable
39537
Determinant of a block upper triangular matrix
37060
The Parallelogram Identity for an inner product space
118025
Kernel of composition of linear transformations
75553
Order of matrices in $GL_2(\mathbb{Z})$
130298
Why is the group of unit upper triangular matrices solvable?
108567
Nielsen & Chuang Exercise 2.2 - “Matrix representations: example”
75429
A Hamel basis for $\ell^p$?
115368
Diagonal Subspace of Cartesian Product
32767
Similar Matrices and Linear Transformations
82962
Partial Ordering of Positive Definite Matrices
108975
The simple modules of upper triangular matrix algebras.
6659
Approximating commuting matrices by commuting diagonalizable matrices
39334
Non-degenerate bilinear forms and invertible matrices
55493
Showing that the path-connected component of the identity matrix in a subgroup of $GL_n(\Bbb R)$ is a normal subgroup
83483
Is there a nice way to classify the ideals of the ring of lower triangular matrices?