3,463 reputation
1751
bio website regularize.wordpress.com
location Braunschweig, Germany
age 36
visits member for 4 years, 6 months
seen 48 mins ago

Professor at TU Braunschweig.

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


13h
awarded  Good Answer
Apr
17
reviewed Reopen Are Modular Collatz Graphs strongly connected?
Apr
14
revised Is there a classification of 2d extended TQFTs with defects?
spelled out TQFT and added link
Apr
14
comment 2, 3, and 4 (a possible fixed point result ?)
As far as I understood, the BGK (Browder-Göhde/Göbel-Kirk) fixed point theorem states that every non-expansive self-mapping on a non-empty, closed and convex subset of a uniformly convex Banach space has a fixed point.
Apr
10
reviewed Leave Open Hiring pointers/communities for quantum mechanics and functional analysis
Apr
7
awarded  Necromancer
Mar
27
comment Hadamard / matrix product adjoint
Ok, I see now. I think a better fit for this question would be scicomp.stackexchange.com. Anyway: The adjoint is defined by $\langle A^* y,x\rangle = \langle y,Ax\rangle$. You do adjoints one by one from outside to inside.
Mar
26
comment Hadamard / matrix product adjoint
Sorry, but this does not make sense. What is the Hadamard product of the matrix S and the vector Fx?
Mar
26
comment Hadamard / matrix product adjoint
Err... So x is a matrix?
Mar
26
comment Hadamard / matrix product adjoint
I could not parse your definition of the operator A. If D and S are matrices, do you build the Hadamard product with the matrix of the Fourier transform?
Mar
26
comment Convergence in energy of bounded (semi)subharmonic functions
Sorry for the late reply: I guess the best thing would be to write an answer yourself so that this is kept for the records.
Mar
26
reviewed Approve Are all rational exactly solvable differential equations known?
Mar
26
reviewed Close Closed Form Solutions To Simple Iterated Polynomial Building Blocks
Mar
24
awarded  Nice Answer
Mar
24
reviewed Leave Open Which way for reading the proofs?
Mar
24
answered Which way for reading the proofs?
Mar
23
reviewed Leave Closed If a polynomial $p(z)$ omits a value, then $p(z)-\dfrac{(1-e^{i\psi})}{n}zp^{\prime}(z)$ also omits that value
Mar
23
reviewed Leave Open Analysis of Sobolev spaces
Mar
17
comment Fredholm integral with functions constrained to [0;1]
For some reason I confused $g$ and $f$. Of course $f$ should be the unknown… Corrected.
Mar
17
revised Fredholm integral with functions constrained to [0;1]
corrected variable names