Join us for coffee and tea at 15.30 p.m.
Tuesday, July 1st 2014
Professor Rafael Ortega
Periodic solutions of the forced pendulum: from existence to stability
Consider the equation $$x''+\beta \sin x=f(t)$$ where $f(t)$ is a periodic forcing. This simple model is a good laboratory to test some global methods in Nonlinear Analysis. Traditionally the existence of periodic solutions is discussed using tools coming from Topology and Calculus of Variations. In this talk we will try to adapt these tools for the study of the stability of these solutions. The results will be of the type "For almost every forcing $f(t)$..." and the notion of set of measure zero in a space of infinite dimensions will play an important role.
Colloquium coordinators are Prof.dr. A.C.D. van Enter (e-mail : A.C.D.van.Enter@rug.nl) and
Dr. A.V. Kiselev (e-mail:
Prof. Slotboom co-applicant in awarded ZonMw project application
On Thursday 10 June, a partial solar eclipse will be visible in the Netherlands. The eclipse will start at 11.21 a.m., with a peak at 12.27 p.m. At 1.36 p.m., the eclipse will be over. Eclipse glasses will be handed out at five locations.
De vier Nederlandse solar teams (Delft, Eindhoven, Groningen, Twente) slaan de handen ineen tegen klimaatverandering De studententeams bouwen hun eigen zonneauto’s en ontwikkelen innovaties voor een duurzamere toekomst, maar zien tegelijkertijd dat...
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