bio  website  regularize.wordpress.com 

location  Braunschweig, Germany  
age  36  
visits  member for  4 years, 11 months 
seen  58 mins ago  
stats  profile views  2,005 
Professor at TU Braunschweig.
Area: Inverse problems, regularization theory, applied functional analysis, mathematical image processing.
55m

reviewed  Close MLE of Gamma when only given observations 
4h

comment 
Optimization problem with an integral in the objective function
Try math.stackexchange.com for this question (or start by deriving $L$ w.r.t . $x$…). 
Aug
24 
comment 
Hyperfunctions supported at a point
Ha! Page 5 is not available in google books for me, this explains my ignorance… 
Aug
24 
comment 
Hyperfunctions supported at a point
I don't know much about hyperfunctions but I am not sure what "coincide" should mean here. A distribution is an element in the dual of smooth functions with compact support while a hyperfunction is an equivalence class of holomorphic functionals. I do not see a canonical way to map one set into the other… E.g. how should a hyperfunction act on a smooth function and how to make such an identification that respects all wanted rules (such as the rules for the derivative…)? 
Aug
22 
comment 
Global minimization. How?
In addition to being very broad and not entirely clear, the question is posted at the wrong website. Try scicomp.stackexchange.com and try to describe all features that your problem has (e.g. number of variables, possible constraints, how expensive are objective function evaluations, is your objective smooth and can you calculate derivatives of your objective?,…). 
Aug
22 
comment 
Construct a PDE solution from a net of approximations
@AlexM. I guess that your limit is something like "largest set in the partition goes to zero". Why not pick sequences of such converging partitions and show that limits are independent of the subsequences? 
Aug
22 
comment 
Construct a PDE solution from a net of approximations
@IgorKhavkine This counterexample does not work with unique solutions (as requested by the OP or the edited question with explicit boundary conditions). 
Aug
22 
answered  Identities and inequalities in analysis and probability 
Aug
22 
comment 
Identities and inequalities in analysis and probability
This is not widely known? 
Aug
22 
comment 
Construct a PDE solution from a net of approximations
@IgorKhavkine I guess the difference is that the OP does not assume that $x_i$ converges to $x$ but only that $f(x)$ converges to zero and wants to conclude the convergence of the $x_i$. 
Aug
22 
comment 
Construct a PDE solution from a net of approximations
I can't imagine a situation in which one naturally has a net of a solution of a PDE which is not a sequence. But maybe that's only my limited imagination… 
Aug
16 
comment 
Looking for the name of a mathematical symbol that looks remotely like 1 (answer: indicator function)
In convex analysis the term indicator functions is used for a function that is zero in some set and plus infinity elsewhere. 
Aug
9 
comment 
Do convolution and multiplication satisfy any nontrivial algebraic identities?
For the anonymous user: You misunderstood the (abused ) notation. The product there is the tensor product and not the point wise product. 
Jul
29 
awarded  Notable Question 
Jul
24 
comment 
How to calculate $det(X^TX)$ efficiently, update one column of X each time
Not a good fit for this side  I suggest scicomp.stackexchange.com. Anyway: Why not do a factorization of $X_1$ (LU or QR) and down and update that? 
Jul
24 
comment 
9point stencil “equivalent” for advection equation
This question should go well on scicomp.stackexchange.com. 
Jul
17 
comment 
question about $TGV^2$ space
Added something on the interpretation with Radon measures… 
Jul
17 
revised 
question about $TGV^2$ space
added 456 characters in body 
Jul
17 
answered  question about $TGV^2$ space 
Jul
17 
comment 
Is this has anything to do with Riesz representation?
Nope, not linear since flipping the sign of my won't flip the sign of the value. 