bio | website | regularize.wordpress.com |
---|---|---|
location | Braunschweig, Germany | |
age | 36 | |
visits | member for | 4 years, 2 months |
seen | 16 hours ago | |
stats | profile views | 1,750 |
Professor at TU Braunschweig.
Area: Inverse problems, regularization theory, applied functional analysis, mathematical image processing.
Jul 24 |
comment |
Proximal operator of modified L1 matrix norm
There are simple rules for the prox of translations (just do substitution in the minimization problem). For the last case I only expect a simple solution for invertable $M$ (again substitute). |
Jul 24 |
answered | Examples of famous 'workhorse' theorems |
Jul 21 |
comment |
Is this graph of reciprocal power means always convex?
Ok, my believe is destroyed… Another interesting question could be. What are $n$ and $p$ such that the respective function has most negative value in its second derivative? |
Jul 21 |
comment |
Is this graph of reciprocal power means always convex?
Good! It still puzzles me, why the quantity is convex in almost every case. I would still believe if somebody told me that convexity is true for large $n$… |
Jul 21 |
comment |
Is this graph of reciprocal power means always convex?
Some tests with extreme cases seem to indicate that the answer may be negative. The small negative part of the second derivative of the function for $n=3$ and values $p = [0.25\ 0.25\ 0.5]$ (see here) does not look like a numerical artifact. Other values that give suspicious results are tuples with a small number of entries (but more that two) that are close to the uniform distribution. |
Jul 18 |
revised |
Proof correctness problem
Spelled out the acronym CFSG (my google search yielded the correct hit on place five…) |
Jul 16 |
comment |
Metrization of weak convergence of signed measures
Sorry for longer quietness, but may I ask what problems do arise with this metric if the measures are signed? I thought that the constraint $|f(\omega)|\leq 1$ would take care of these. In the metric we use differences of measures anyway so what goes in the norm is generall signed. |
Jul 16 |
reviewed | Approve suggested edit on Sum over growing Young tableaux |
Jul 16 |
accepted | Is the prox-residual monotone? |
Jul 16 |
comment |
Is the prox-residual monotone?
Great, thanks! Somehow, my examples where either somehow isotropic or random and did not show this behavior. |
Jul 15 |
asked | Is the prox-residual monotone? |
Jul 15 |
asked | Geometric measures different from Hausdorff |
Jul 14 |
awarded | Nice Question |
Jul 12 |
comment |
Heuristic interpretation of the 'third index' for Besov and Triebel-Lizorkin spaces
Finally somebody asked this here! (I wonder why I did not…) |
Jul 5 |
reviewed | Approve suggested edit on What is natural about the well-known bijection between conjugacy classes and irreps of a symmetric group? |
Jul 4 |
answered | Mathematicians who made important contributions outside their own field? |
Jul 2 |
awarded | Curious |
Jun 26 |
answered | Relativistic Control Theory |
Jun 19 |
answered | Discrete gradient on point clouds |
Jun 17 |
answered | Roots of modified polynomials |