Showing that any linear operator can be written as a sum of Hermitian matrices
121253
Prove that any complex matrix can be expressed in term of Hermitian and anti-Hermitian matrices
109573
Is sum of two orthogonal matrices singular?
131906
"An operator is hermitian". Implications?
13137
Why are Hermitian operators linked to observables?
27901
Proving $\sum\limits_{i=1}^k | \langle x,v_i \rangle \langle y,v_i\rangle| \leq \|x\|\cdot \|y\|$
109512
Let f,g be bilinear forms on a finite dimensional vector space. Show that there exist unique linear operators
116558
Consider two linear operators $\hat{A}$ and $\hat{B}$. Show that $e^{\hat{A}}e^{\hat{B}}=e^{\hat{A}+\hat{B}}e^{[\hat{A},\hat{B}]/2}$
133449
A proof that an orthogonal matrix with a determinant 1 is a rotation matrix
137209
Finding the Matrix of a Linear Operator Satisfying a Polynomial
106097
Spectrum of the sum of two commuting matrices
26801
Show that orthogonal matrices are diagonalizable
17031
Idempotent linear operators are projections
70606
Show that the LU decomposition of matrices of the form $\left[\begin{smallmatrix}0& x\\0 & y\end{smallmatrix}\right]$ is not unique
60598
Matrix $A^T A$ as sum of outer products
138342
Proof of a matrix exponential identity
14111
Determining possible minimal polynomials for a rank one linear operator
145768
The inverse of a matrix in which the sum of each row is $1$