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<DIV><FONT face=Arial size=2>Gentile prof./dott., </FONT></DIV>
<DIV><FONT face=Arial size=2>la avvertiamo che nei prossimi giorni alla Scuola
Normale si terrà il seguente seminari di matematica nell'ambito dei Colloqui De
Giorgi:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Giovedì 10 aprile 2003, in aula Mancini alle ore
15:00,</FONT></DIV>
<DIV><FONT face=Arial size=2><STRONG>Prof. Hakan Eliasson</STRONG> - Parigi
VII</FONT></DIV>
<DIV><FONT face=Arial size=2>"Q</FONT><FONT face=Arial size=2>uasi-periodic
Schroedinger operators - spectral theory and dynamics"</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Abstract: T</FONT><FONT face=Arial size=2>he
quasi-periodic schroeinger operator in one dimension has a very rich structure.
It has a spectrum that tends to be a Cantor set, and may have absolutely
cintinuous, singular continuous or pure point spectral types. From dynamical
point of view it displays both integrable and non-uniformly hyperboic
dynamics with homoclinic solutions.<BR>These operators have been intensively
studied during the last 25 years but are still far from being completely
understood.<BR>--------<BR>Cordiali saluti</FONT></DIV>
<DIV><FONT face=Arial size=2>SEGRETERIA DELLA CLASSE DI
SCIENZE</DIV></FONT></BODY></HTML>