The Mathematical Colloquium

• Wednesday 15 February 2012, Vallfarten 13.15–14.15, Irina Asekritova, MAI
  On invertibility of linear operators in interpolation spaces
  Abstract: Let $A$ be a linear bounded operator from a Banach couple $\overrightarrow{X}=(X_{0},X_{1})$ to a Banach couple $\overrightarrow{Y}=(Y_{0},Y_{1})$ such that the restrictions of $A$ to the spaces $X_{0}$ and $X_{1}$ have bounded inverses. This condition does not imply that the restriction of the operator $A$ to the real interpolation space $(X_{0},X_{1})_{\theta ,q}$ has a bounded inverse for all values of the parameters $\theta $ and $q$. I plan to discuss the following problem: how can we describe all spaces $(X_{0},X_{1})_{\theta ,q}$ such that the operator $A:(X_{0},X_{1})_{\theta ,q}\rightarrow (Y_{0},Y_{1})_{\theta ,q}$ is invertible? The talk is based on joint work with N. Kruglyak.
• Wednesday 22 February 2012, No colloquium.
• Wednesday 29 February 2012, Vallfarten 13.15–14.15, Niklas Lundström, Umeå universitet
  
• Monday 5 March 2012, Kompakta rummet 13.15–14.15, Per Enflo, Kent State University, USA
  
• Wednesday 7 March 2012, Kompakta rummet 13.15–14.15, Sergey Vakulenko, Institute of Mechanical Engineering Problems, Saint Petersburg, Russia
  
• Wednesday 14 March 2012, Kompakta rummet 13.15–14.15, Andrés Navas, Universidad de Santiago de Chile
  
• Wednesday 21 March 2012, Kompakta rummet 13.15–14.15, Rögnvaldur G. Möller, University of Iceland
  
• Wednesday 28 March 2012, Kompakta rummet 13.15–14.15, Ryszard Rubinsztein, Uppsala universitet
  
• Wednesday 4 April 2012, Kompakta rummet 13.15–14.15, Michelle Bucher, University of Geneva, Switzerland
  
• Wednesday 11 April 2012, Kompakta rummet 13.15–14.15, Sergey Nazarov, Russian Academy of Sciences, Saint Petersburg, Russia
  
• Wednesday 18 April 2012, Kompakta rummet 13.15–14.15, Martin Bridson, University of Oxford, UK
  
• Wednesday 25 April 2012, TBA
  
• Wednesday 2 May 2012, TBA
  
• Wednesday 9 May 2012, Kompakta rummet 13.15–14.15, Ruth Kellerhals, University of Fribourg, Switzerland
  
• Wednesday 16 May 2012, Kompakta rummet 13.15–14.15, Maria del Carmen Reguera Rodriguez, Lunds universitet
  
• 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.

Earlier colloquia

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