The NBFAS meeting took place on Tuesday March 25th, ending in time for the start of the BMC 2008 at the University of York.

The talks were at 12.15-13.15 and 13.45-14.45, in room C/A/101, Chemistry Building, University of York.

**Prof. Albrecht Böttcher (TU Chemnitz, Germany)**

Stability and Instability of Spectra and Related Sets

*Abstract:* It is well known that if a sequence of
operators converges uniformly to a limit, then the
spectra of these operators need not converge to
the spectrum of the limit operator. In contrast to
this, their pseudospectra converge to the
pseudospectrum of the limit - provided we are in
Hilbert space or in nice Banach spaces. These and
some more sophisticated questions will be discussed
in the two talks, which are addressed to postgraduates
but might also contain a few issues of interest to
experienced specialists in functional analysis and
operator theory. As Toeplitz operators are the
speaker's favourites, these will play an essential
role and figure as a rich source of illustrating
examples.

There was also a postgraduate conference in the morning of March 25th.

Sandra Pott, NBFAS Secretary.

PDF version of notice Campus map (PDF)

The address of this page is
**http://www.maths.leeds.ac.uk/nbfas/york08.html**

Last updated on March 25th 2008 by Jonathan Partington.