- June 17, 2011, Friday - 14h15 (Room P
3.10):
António Ferreira
dos Santos
(Instituto Superior Técnico, UTL and CEAF)
" Riemann-Hilbert
problems, Lax equations and singularities "
Abstract. The existence of singularities of
solutions of Lax equations is related to the kernel of a Toeplitz
operator.The singularities are obtained from the study of an associated
Riemann-Hilbert problem. An example is presented.
- June 17, 2011, Friday - 15h00 (Room P
3.10):
Cláudio Fernandes
(Universidade Nova de Lisboa and CEAF)
" A
C*-algebra of singular integral operators with shifts having periodic
points "
Abstract. A Fredholm symbol for a nonlocal operator
C*-algebra B of singular integral operators, with an amenable discrete
group of homeomorphisms having the same nonempty set of periodic
points, is obtained. Using the spectral measure associated with a
general isometric representation of B we will see how we can reduce the
study of the Fredholmness in B to the study of the Fredholmness in a
C*-algebra B_F of singular integral operators with a group of
homeomorphisms with fixed points. This talk is based on a joint work
with M. A. Bastos and Y. Karlovich.
Past Seminars
2010/11
2009/10
2008/09
2007/08
2006/07
2005/06
2004/05
2003/04
2002/03
2001/02
2000/01
1999/2000
1998/99
1997/98
1996/97
1995/96
Seminars take place in
Lisbon, I.S.T. -
Post Graduation Building
