3,082 reputation
933
bio website math.uni-trier.de/~wengenroth
location Universität Trier
age 47
visits member for 3 years, 7 months
seen 14 hours ago
I am Professor for Mathematics at the Unversität Trier (Germany)

Aug
25
comment Hyperfunctions supported at a point
Distributions were invented by Laurent SCHWARTZ (not Schwarz).
Aug
25
reviewed Approve Equivalence classes of pairs linear transformations
Aug
24
comment $A = \left\{ {{P_\Delta }(\lambda ):\left\| {{\Delta _j}} \right\| \le \varepsilon ,j = 0,1,2…m} \right\} \Rightarrow$A is closed
@user78481 Try at math.stackexchange.com
Aug
24
revised Riemannian metrics preserved by diffeomorphisms
improved formatting
Aug
20
comment $\mathbb{P}(d(X,Y)>\alpha)<\beta$ if $\mathbb{P}(X\in E)\leq \mathbb{P}(Y\in E^{\alpha})+\beta$ for all measurable E
Why only hints?
Aug
19
comment The union of weighted compact supported continuous function
But you wrote: To make question more interesting, I delete the assumption that $v\in L^1_{loc}$ and hence $v$ could be $+\infty$ over a positive measure set.
Aug
19
comment The union of weighted compact supported continuous function
What about constant weights $v=\infty$ and $v_n=n$?
Aug
18
comment The union of weighted compact supported continuous function
I do not get the question: Apparently $C_c(\Omega)$ is the space of continuous functions with compact support. But $u$ and $u/v$ have the same support so that $C_c(\Omega,v)=C_c(\Omega)$???
Aug
10
comment Is the space of vectorial functions that are Dunford integrable complete?
Is there any obstacle when trying the usual proof that e.g. $L^1(\Omega,\Sigma,\mu)$ is complete?
Aug
9
answered Smoothness of a power of smooth non-negative function
Aug
5
reviewed Approve Symmetries of non-Riemannian curvature tensor
Jul
23
answered Generalized functions on a product of two manifolds
Jul
20
comment Oriented volume and determinants: Circularity
@DeaneYang Okay, this a way to avoid the circularity. Thanks.
Jul
18
reviewed Approve Commutative algebra books representing the edge of research
Jul
18
comment Oriented volume and determinants: Circularity
@DeaneYang Your suggestion thus uses determinants (to show that $GL(n)$ has two path components) in the definitionof orientation.
Jul
17
asked Oriented volume and determinants: Circularity
Jun
23
comment When does analytic in the operator norm imply analytic in the trace class norm?
Extending a bit Christian Remling's comment: Grothendieck proved that for a complete locally convex space $X$ a function $f:U\to X$ is holomorphic if $\varphi\circ f:U\to \mathbb C$ is holomorphic for all continuous linear functionals $\varphi$ on $X$. As far as I remember, one does not even need all $\varphi$.
Jun
15
comment Exponential rule for Whitney-$\mathcal{C}^{\infty}$-topology
Time to create an "Ask-Michor-tag". More seriously, Peter Michor, Andreas Kriegl, and collaborators did a lot on such questions for a big variety of function spaces. Look for "convenient calculus".
Jun
15
accepted The list of problems for Grothendieck's thesis
Jun
15
awarded  Nice Question