246 reputation
126
bio website iam.uni-bonn.de/users/zaal
location Germany
age 27
visits member for 3 years, 7 months
seen 21 hours ago

I'm a mathematician working at University of Bonn. As a standard, I use (AMS-)LaTeX and BibTeX for my documents.

My main research interest is variational calculus, in particular a generalized notion of gradient flow.

I have also been involved in a few programming projects, using Delphi 2007, MySQL and PHP. I mainly work on datastructure and algorithms (the stuff going on 'behind the interface').

Have a look at my website at University of Bonn


Feb
11
awarded  Informed
Nov
17
awarded  Fanatic
May
14
awarded  Caucus
Jan
24
answered sequence of continuous linear operators on banach spaces
Jan
21
comment $\text{Sup}\{x\geq0:\sum\limits_{n=1}^\infty x^{\sqrt n}<\infty \}$
@tetori: I see. Seems to be correct.
Jan
21
answered Differentiability on vector values function
Jan
21
answered Pre-Image of a continuous function
Jan
21
awarded  Critic
Jan
21
comment $\text{Sup}\{x\geq0:\sum\limits_{n=1}^\infty x^{\sqrt n}<\infty \}$
This is not what is asked: OP would like to know for what values of $x$ the sum does converge.
Jan
18
awarded  Enthusiast
Dec
28
awarded  Yearling
Dec
28
answered A question about uniform convergence in $\mathbb R$
Dec
25
answered Can fourier transform of a function with not empty support be zero on whole range?
Dec
20
comment $A$ convex subset of a set has 'smaller' boundary than the set?
@Sgernesto: probably, this is the same argument
Dec
20
awarded  Teacher
Dec
20
answered Shortest curve that divides circle into two regions of equal area
Dec
20
answered $A$ convex subset of a set has 'smaller' boundary than the set?
Dec
12
comment is my function absolutely continuous?
In the second paragraph, you describe uniform continuity, not absolute continuity. The counterexample provided by Arthur is indeed not absolutely continuous, but it is uniformly continuous (even Lipschitz)
Feb
13
awarded  Supporter
Aug
30
awarded  Autobiographer