Notice: Lately I have been experiencing severe difficulties with my Utrecht University email address. If you want to be sure that I read your email in time, please send it to sj "pipe" dydx.nl and replace "pipe" with the usual symbol.


My name is Sebastiaan Janssens. I work in Utrecht, The Netherlands, as a PhD student of Odo Diekmann and Stephan van Gils. My interests center around
  • dynamical systems (non-linear dynamics in spaces of measures, delay equations, bifurcation theory, evolution semigroups, discrete dynamics, piecewise smooth systems)

  • real and abstract analysis (measure theory, functional analysis, rigorous numerical approximation, measure-theoretic probability)

  • mathematical biology (structured population dynamics, resource competition, synchronisation and concentration phenomena)

  • mathematical economics (microeconomics, game theory, general equilibrium theory, theory of economic growth)

A Dutchman without a pipe is a national impossibility.
If a Dutchman were deprived of his pipe and tobacco,
he would not even enter Paradise with a glad heart.
-- Johannes Christiaan Schotel (?)





I do not fully agree to all the views expressed by the
creators of the above site, but they deserve support nevertheless. Someone needs to speak up. 		The Netherlands used to be a liberal country in the true sense of the word. People were first and foremost treated as individuals, rather than as members of an ethnic or social group.

Over the past years this has changed. The incubent Dutch gouvernment creates policies based on fear and populistic short-term goals while held hostage by a party of imbeciles with a fundamental lack of respect for democracy, the arts and sciences, human dignity and common sense.

This must stop at once.

Contact Details

Sebastiaan Janssens
Mathematical Institute
Budapestlaan 6
3584 CD Utrecht
The Netherlands
room: 8.05



Teaching

  • Spring 2011: Differential equations exercise class (see course page)

  • Spring 2011: Linear Algebra B exercise class (see course page)

  • In the academic year 2009-2010 the MRI offers an international masterclass on Numerical Bifurcation Analysis of Dynamical Systems in which I occasionally assisted. For more information, see Yuri Kuznetsov's page on this. 
  • In Autumn 2008 I again taught "Wat is Wiskunde" (What is Mathematics?), an introductory course for first-year mathematics students aimed at obtaining a working knowledge about logic, sets, proofs, functions and relations.

  • In Spring 2008 I assisted in the national master course "Dynamical systems generated by ordinary differential equations and maps". See this page for lecture notes, practicum sessions and more.

  • In Autumn 2007 I taught "Wat is Wiskunde" (What is Mathematics?), an introductory course for first-year mathematics students aimed at obtaining a working knowledge about logic, sets, proofs, functions and relations.

Bookmarks by Category 

These are primarily for myself, so I can always find them, but they may be of use to others, too. Besides, I sometimes get the feeling that nowadays one's online-identity is more or less defined by the pages one links to, i.e. "to know a man is to know his links".

Religion

Curious George smoking a pipe
“I am tolerant because religious institutions facilitate some very important work that would not get done otherwise, but then I look around and see what an incredible amount of damage religion is doing… It would not matter so much that people believe lies, but when they go out and beat other people up because they believe different lies, that’s another thing.”

Taken from a 2001 interview with John Maynard Smith (1920-2004)

I cannot but concur.


Last Update: 27-01-2012