Martijn

236 reputation

bio	website	iam.uni-bonn.de/users/zaal
	location	Netherlands
	age	27
visits	member for	2 years, 8 months
	seen	12 hours ago
stats	profile views	25

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

	236 reputation	bio	website	iam.uni-bonn.de/users/zaal	visits	member for	2 years, 8 months
25 badges		location	Netherlands		seen	12 hours ago

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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