bio | website | regularize.wordpress.com |
---|---|---|
location | Braunschweig, Germany | |
age | 36 | |
visits | member for | 4 years, 10 months |
seen | 2 days ago | |
stats | profile views | 1,991 |
Professor at TU Braunschweig.
Area: Inverse problems, regularization theory, applied functional analysis, mathematical image processing.
Nov 24 |
comment |
fixed point arguments in PDE
Would Schauder's fixed point theorem be standard or advanced? |
Nov 14 |
comment |
Why is the Gaussian so pervasive in mathematics?
Isn't this connection the reason why the Gaussian is called Gaussian? If I remember correctly, Gauss introduced "least squares" as a regression technique not because its derivative gives rise to a linear problem but because the square fits the "normal error model", i.e. corresponds to the Gaussian distribution. |
Nov 13 |
comment |
Weak convergence of the image of a weakly $L^1$ converging sequence
Not an answer, but I vaguely recall that the only functions $f$ for which $u_k$ weakly to $u$ implies $f(u_k)$ weakly to $f(u)$ are affine linear $f$'s. |
Nov 5 |
awarded | Nice Answer |
Nov 1 |
answered | A sudden smiley? :-) |
Oct 22 |
awarded | Popular Question |
Oct 20 |
comment |
Inversion of Radon transform by incomplete data: specific case
Could you expand on the relation of the Radon transform and economics? (Out of curiosity.) |
Oct 19 |
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What software one needs to solve a big linear system on a small computer?
I also recommend octave. 10000 x 10000 is doable, although the matrix needs 800MB (if not sparse). On my laptop it takes about a minute to solve a system like this. |
Oct 16 |
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Measuring almost-critical values of smooth functions.
Did you inspect the one-dimensional case $X=\mathbb{R}$? I suspect that basically arbitrary functions $M_f$ are possible. |
Oct 15 |
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Terminology for notion dual to “support”
I don't know if this point is important, but usually, the support of $f$ is the closure of the set on which $f$ is non-zero (assuming some topology on the domain of $f$). |
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 |
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When should I publish my results?
This question could also have been asked at academia.stackexchange.com |
Oct 3 |
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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 |
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How should an analytic number theorist look at Bessel functions?
Isn't there some $f$ missing in the formula for $\hat f$? |