loup blanc's user avatar
loup blanc's user avatar
loup blanc's user avatar
loup blanc
  • Member for 13 years, 6 months
  • Last seen this week
2 votes

Diagonal Lyapunov equation with rank 1

2 votes

Non-asympototic version of Gelfand's formula

2 votes

Proof of a matrix implication

2 votes

When is the rank of $AB+BA$ equal to one?

2 votes
Accepted

Efficiently solve the Sylvester equation $AX+XA = C$ where $X$ is skew-symmetric

2 votes
Accepted

Solvability of $A X B=C$ with $X=X^\mathrm{T}$

2 votes

Right inverse of integer matrix

1 vote

Find $Y\in\operatorname{GL}_n(\mathbb{Z})$ such that all eigenvalues of $YX$ are nonnegative

1 vote

Solve permutation matrix equations of the form: $X^T A X = B_1$ and $X A X^T = B_2$

1 vote

Complexity of solving linear equations plus disequality constraints $a \ne b$

1 vote

How many matrices $C \in \mathrm{M}_3(\mathbb{F}_q)$ such that $\det(C-A)=\det(C-B) = 1$?

1 vote
Accepted

Conditions for a certain matrix equation to have a full rank solution

1 vote

Linear transformation that preserves the determinant

1 vote

When is $(I - X)^{-\top} \circ X = 0$?

1 vote

System of quadratic equations

1 vote

Computing conjugacy between two elements of $\mathrm{SL}_2(\mathbb{Z})$

1 vote
Accepted

System of quadratic complex equations

1 vote

Mixing Numerical Range and inner product

1 vote
Accepted

Matrix equation XAX=B where the solution must be diagonal

1 vote

The derivative of the Cholesky factor

1 vote

Perturbation of Cholesky decomposition for matrix inversion

1 vote

Matrix derivative with respect to the pseudo-inverse

1 vote

Asymptotic property of a quadratic form

1 vote

eigen-decomposition solution? is it unique?

1 vote

How to transform matrix to this form by unitary transformation?

1 vote
Accepted

Find the transformation $P$ that minimizes the following:

1 vote

Hessian of function of covariance matrices

1 vote
Accepted

Best rank one approximation

1 vote

positive semidefiniteness: a psd matrix substracted by another rank 1 psd matrix

1 vote

Injectivity of a multivariate homogeneous polynomial mapping