3,174 reputation
1348
bio website regularize.wordpress.com
location Braunschweig, Germany
age 36
visits member for 4 years, 2 months
seen yesterday

Professor at TU Braunschweig.

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


1d
comment Image of (right) inverse trace map $\xi\colon H^{\frac 12}(\partial\Omega) \to H^1(\Omega)$ dense in $H^1(\Omega)$?
Ok, right - I thought that I had a basic misconception about the problem…
1d
comment journal to submit mathematic books' review
The German "Mathematische Semesterberichte" publishes such reviews (probably only in German).
1d
reviewed Close How to construct a graph with arbitrarily large girth and large chromatic number?
1d
reviewed Leave Open Image of (right) inverse trace map $\xi\colon H^{\frac 12}(\partial\Omega) \to H^1(\Omega)$ dense in $H^1(\Omega)$?
1d
comment Image of (right) inverse trace map $\xi\colon H^{\frac 12}(\partial\Omega) \to H^1(\Omega)$ dense in $H^1(\Omega)$?
Isn't solving the respective Dirichlet problem saying that the image contains $H^{3/2}$?
Dec
16
reviewed Close Derangement,recursion and circular permutation
Dec
16
reviewed Close Alexander duality theorem
Dec
12
reviewed Leave Open $\Delta$ is generator, $u\in D_{loc}(\Delta) \cap L_{loc}^{\infty}$ and $\varphi \in D(\Delta) \cap L^{\infty}$, then $u\cdot \varphi \in D(\Delta)$?
Dec
12
reviewed Leave Open The singular value of $F(\theta)=\sin\theta\int_{-a}^{a}e^{-ikz\cos\theta}f(z)dz.$
Dec
11
revised What is an extragradient method?
corrected spelling
Dec
10
answered Galerkin Projection on Integral Operators
Dec
10
answered What is an extragradient method?
Dec
7
comment Banach space of discontinuous functions(Killing continuous functions)
"Appropriate quotient space" Do you have an idea how this space looks like (or how the space which you divide by)? I guess the quotient contains all characteristic functions of all points and then it wouldn't be separable in the first norm. The second norm looks pretty weired to me…
Dec
4
comment $Ax=b$ in a function space
I am not sure what you are after. Do you want to show that the solution depends continuously on the matrix? Are you especially interested in the case where $A$ gets singular?
Nov
27
awarded  Notable Question
Nov
25
accepted Geometric measures different from Hausdorff
Nov
25
comment Continuous versions of tensors/ Tensors with infinite indices?
A situation where this works pretty straightforward is the case of functionals on $L^2$ (also on $L^p$ with $1<p<\infty$). There, the functionals are identified with functions, e.g. $(L^2)'=L^2$ and the tensor product of $L^2$ with itself is simple enough (en.wikipedia.org/wiki/Tensor_product_of_Hilbert_spaces).
Nov
25
comment Reference for a strong intermediate value theorem for measures
Actually, your statement is not strictly stronger than the result the OP is asking for since he wants the sets $S_t$ to be nested.
Nov
20
reviewed Leave Open “Almost” zeta function
Nov
19
comment Removing constraints in convex optimization
Well, ehm, actually I don't see it either… Adapted my answer which is only a "partial answer" now…