bio | website | regularize.wordpress.com |
---|---|---|
location | Braunschweig, Germany | |
age | 36 | |
visits | member for | 4 years, 8 months |
seen | 4 hours ago | |
stats | profile views | 1,945 |
Professor at TU Braunschweig.
Area: Inverse problems, regularization theory, applied functional analysis, mathematical image processing.
May 22 |
reviewed | Close Searching for $C^*$ |
May 22 |
reviewed | Close Maximum entropy to fit Johnson distribution by moments |
May 20 |
comment |
Projecting a convex partition onto a convex set
Err, sorry - of course, nonempty $X$ it should be… |
May 20 |
comment |
Projecting a convex partition onto a convex set
$X$ could be empty or have $n-1$ points... You need some more conditions. |
May 19 |
comment |
Splines linearly independent
What do you mean by "its unique smooth extension"? |
May 14 |
comment |
Which way for reading the proofs?
@fanzheng I heard a similar quote about a famous optimizer "I don't read papers, I write them." |
May 13 |
answered | Rate of convergence for cyclic gradient descent |
May 12 |
awarded | Necromancer |
May 12 |
reviewed | Close Can the image of a disk have nontrivial Hausdorff measure for $1 < d < 2$? |
May 6 |
answered | Examples of common false beliefs in mathematics |
Apr 24 |
reviewed | Approve Embedding Theorem for topological spaces, and in general |
Apr 23 |
comment |
l1 Quadratic Programming
Noting that the above problem has all these guys as variables: Isn't that in standard for already? |
Apr 23 |
comment |
A question involving Mazur's Lemma
Well, the degenerate case $y_n = x_n$ does not work so some assumption on the convex combination is needed. |
Apr 21 |
reviewed | Reopen Decomposition space of $\mathbb{C}$ by concentric circles |
Apr 20 |
awarded | Good Answer |
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 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? |