3,538 reputation
1851
bio website regularize.wordpress.com
location Braunschweig, Germany
age 36
visits member for 4 years, 8 months
seen 6 hours ago

Professor at TU Braunschweig.

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


Oct
15
revised Convex Combination of 2 hermitian matrices
made matrices indefinite
Oct
15
comment Convex Combination of 2 hermitian matrices
Oh yes - why not...
Oct
15
answered Convex Combination of 2 hermitian matrices
Oct
10
comment When should I publish my results?
This question could also have been asked at academia.stackexchange.com
Oct
3
comment sequences of plane measures converging to a singular one: terminology, etc
Correct. BY the way: The former ones (uniform measures on "full" triangles) are absolutely continuous w.r.t. Lebesgue measure. Probably also Lebesgue's decomposition theorem (en.wikipedia.org/wiki/Lebesgue%27s_decomposition_theorem) could be helpful.
Oct
3
answered sequences of plane measures converging to a singular one: terminology, etc
Sep
29
awarded  Yearling
Sep
13
answered Log-nonexpansive functions: terminology and references
Sep
10
comment Linear system of equations with nonnegative solutions and a recursion rule
OEIS (oeis.org) does not know both sequences...
Aug
30
comment How should an analytic number theorist look at Bessel functions?
Isn't there some $f$ missing in the formula for $\hat f$?
Aug
27
asked Sarrus rules for 4 times 4
Aug
21
comment eBook readers for mathematics
Another short update: I used it for several weeks now and I have to say that the battery lasts almost as long as for usual paper books. I basically never have to recharge. The time the ebook is connected with the computer to upload new stuff is almost enough to recharge.
Jul
23
comment eBook readers for mathematics
A short update from my perspective: I uns the PocketBook Pro 912 and I am also very happy. It reads and rescales djvu and pdf. Cross-Refs in pdf still do not work. You take notes with a stylus but this is sometimes very slow.
Jul
18
awarded  Civic Duty
Jul
11
comment Convergence rate of fourier partial sum
Have you checked the reference which is given there? However, looks like off-topic here (see mathoverflow.net/faq).
Jul
10
awarded  Good Answer
Jul
9
comment What functions can be obtained as a convolution of a Schwartz function and a tempered distribution?
Would you mind to show the argument?
Jul
9
answered Fiction books about mathematicians?
Jul
7
awarded  Organizer
Jul
7
comment $\ell_o$ Minimization (Minimizing the support of a vector)
Still a question remains: What is the aim of your reformulation? In other words: what is wrong with the $\ell^0$-minimization problem? As you have written: The problem is NP-hard and hence, there will be no "easy" reformulation with out any further assumption on $A$ (unless $P=NP$).