The Mathematical Colloquium

• Wednesday 16 May 2012, Kompakta rummet 13.15–14.15, Sergey Nazarov, Russian Academy of Sciences, Saint Petersburg
  Spectral gaps for double periodic perforated media
  (Joint with the Analysis seminar series.)
  Abstract: It will be shown that both, the Dirichlet and the Neumann problems for the Laplace operator in the plane perforated with the double periodic family of circular holes may have spectral gaps in their spectra. The method of investigation has, necessarily, crucial difference with the case of a waveguide. The famous golden section $0.6180\ldots$ appears in several related calculations. Some other geometries and open questions will be demonstrated.
• Wednesday 23 May 2012, No colloquium.
• Wednesday 30 May 2012, Kompakta rummet 13.15–14.15, Hjalmar Rosengren, Chalmers
  
• Wednesday 6 June 2012, No colloquium.

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Earlier colloquia

Colloquia held in 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012.