Ludwig
  • Member for 7 years, 1 month
  • Last seen this week
  • Berlin, Germany
15 answers
27 votes
4k views
16 bookmarks
Unconventional examples of mathematical modelling
4 answers
18 votes
1k views
6 bookmarks
A seemingly simple inequality
2 answers
16 votes
446 views
3 bookmarks
The number of 0-1 normal matrices
2 answers
13 votes
1k views
5 bookmarks
A log inequality for positive definite trace-one matrices
2 answers
11 votes
578 views
5 bookmarks
A (linear) optimization problem subject to (linear) matrix inequality constraints
2 answers
9 votes
470 views
3 bookmarks
A trace-constrained maximization problem in the cone of positive definite matrices
1 answers
9 votes
617 views
4 bookmarks
Maximizing a ratio of determinants
1 answers
8 votes
830 views
(In)stability of a two-dimensional dynamical system
0 answers
8 votes
244 views
A limiting sequence of positive definite matrices
1 answers
8 votes
765 views
2 bookmarks
A generalized log inequality for positive definite trace-one matrices
3 answers
7 votes
499 views
1 bookmarks
Trace of a nonlinear matrix equation (cont'd)
1 answers
6 votes
355 views
4 bookmarks
Asymptotic behavior of a certain trigonometric partial sum
1 answers
6 votes
403 views
1 bookmarks
On a trace condition for positive definite $2\times 2$ block matrices
1 answers
5 votes
341 views
2 bookmarks
$(AB)^+\approx B^+A^+$ for $B$ "fat" enough?
1 answers
5 votes
139 views
1 bookmarks
Finding a particular matrix factor
1 answers
5 votes
351 views
1 bookmarks
Trace of a nonlinear matrix equation
3 answers
4 votes
202 views
2 bookmarks
Properties of matrix $X=\left[\frac{1}{1-\bar\alpha_i \alpha_j}\right]_{ij}$
0 answers
4 votes
205 views
3 bookmarks
Is every stable matrix orthogonally similar to a $D$-skew-symmetric matrix?
2 answers
4 votes
166 views
1 bookmarks
Eigenvalue density of a symmetric tridiagonal matrix
1 answers
4 votes
145 views
Perturbing the constant term of a polynomial and implications to stability
0 answers
4 votes
203 views
1 bookmarks
Maximizing a certain eigenvalue ratio
1 answers
4 votes
361 views
2 bookmarks
On a vanishing integral inner product
0 answers
4 votes
79 views
2 bookmarks
Non-singularity of a series of matrices
1 answers
4 votes
195 views
$\mathrm{diag}\left[(A+D)^{-1}\right] \ge \left[\mathrm{diag}(A)+D\right]^{-1}$?
1 answers
4 votes
315 views
On the solvability of a matrix equation
2 answers
4 votes
599 views
Conditions for convergence to non-isolated fixed points
0 answers
4 votes
217 views
On contractive properties of a nonlinear matrix algorithm
0 answers
3 votes
234 views
1 bookmarks
On the existence of fixed points of a matrix iteration
0 answers
3 votes
150 views
On a matrix inequality based on the Schur-Horn theorem
1 answers
3 votes
272 views
Bounding a series of nested integrals