3,094 reputation
1248
bio website regularize.wordpress.com
location Braunschweig, Germany
age 36
visits member for 4 years, 2 months
seen 58 mins ago

Professor at TU Braunschweig.

Area: Inverse problems, regularization theory, applied functional analysis, mathematical image processing.


Oct
14
comment What is the maximum diameter of $N$ steps of a random walk?
Thanks so far for the comments and references! I'll check them out. @Igor: Is this also called Brownian motion if it is time discrete? Would it be right to say that the time discrete model is a sampled continuous Brownian motion? Sorry for my ignorance on this topic...
Oct
13
asked What is the maximum diameter of $N$ steps of a random walk?
Oct
12
comment Best Poincare constants on the surface of a ball
Are there any such maps $\xi$ in the case of $\mathbb{R}^2$ which are in $H^1$?
Oct
7
comment Fast root finding for strictly decreasing function
How fast? Is the derivative available? What is wrong with bisection?
Sep
30
awarded  Yearling
Sep
26
comment One-line proof of the Euler's reflection formula
Could a down-to-earth proof have one line?
Sep
20
comment Do you know this form of an uncertainty principle?
I got a little bit confused with all these different inequalities around (many of them called Caffarelli-Kohn-Nirenberg) but now I see. That's an interesting relation though. The Heisenberg uncertainty is also included? ($\gamma=\alpha=0$, $\beta=−1$, $a=1/2$)
Sep
20
comment Do you know this form of an uncertainty principle?
Wow, there are lot of constants involved. As far as I've seen, it seems that the case $\gamma=0$, $a=1$ and $\alpha=-1$ is not included?
Sep
20
asked Do you know this form of an uncertainty principle?
Sep
19
comment Decomposing max-convolution of sum of functions ?
Sorry, I do not get several points: What are $x$, $y$, $dx$ and $dy$? What are the $d_i$'s? What do you mean by "random" matrices (especially in the light that they seem to depend on $x$ and $y$)?
Sep
12
comment Unique limits of sequences plus what implies Hausdorff?
Thanks! Especially the topospaces.subwiki.org is pretty cool...
Sep
7
revised When does symmetry in an optimization problem imply that all variables are equal at optimality?
Corrected wording
Sep
7
comment Unique limits of sequences plus what implies Hausdorff?
I'm a bit confused. The Wikipedia page says that Frechet spaces are indeed Hausdorff. Also: Why do you have unique limits of sequences in the cocountable topology?
Sep
7
revised Unique limits of sequences plus what implies Hausdorff?
Corrected link
Sep
7
accepted Unique limits of sequences plus what implies Hausdorff?
Sep
7
comment Unique limits of sequences plus what implies Hausdorff?
Thanks! To clarify: First countable + non-Hausdorff implies "non-unique limits" and hence, "unique limits" + first countable implies Hausdorff, right?
Sep
7
asked Unique limits of sequences plus what implies Hausdorff?
Sep
7
comment Mathematical habits of thought and action which would be of use to non-mathematicians
I guess that this technique is widely known in management under the name ""scenario technique"...
Aug
29
awarded  Nice Answer
Jul
23
comment Dual operators between Hilbert spaces : With or without riesz representation
I use the notion "dual" for the first one and "Hilbert space dual" for the second one...