BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Sabre//Sabre VObject 4.5.7//EN
CALSCALE:GREGORIAN
BEGIN:VTIMEZONE
TZID:Europe/Zurich
X-LIC-LOCATION:Europe/Zurich
TZURL:http://tzurl.org/zoneinfo/Europe/Zurich
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:19810329T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:19961027T030000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
UID:news1975@dmi.unibas.ch
DTSTAMP;TZID=Europe/Zurich:20260211T113718
DTSTART;TZID=Europe/Zurich:20260120T103000
SUMMARY:Seminar Algebra and Geometry: Gebhard Martin (Universität Bonn)
DESCRIPTION:Salem numbers appear naturally as dynamical degrees of isometri
 es of hyperbolic lattices and hence in the study of entropy of surface aut
 omorphisms. The conjecturally smallest Salem number is Lehmer's number $\\
 lambda_{10}$\, which can be realized by automorphisms of K3 surfaces and r
 ational surfaces by work of McMullen. In this talk\, I will explain how to
  generalize a result of Oguiso asserting the non-realizability of $\\lambd
 a_{10}$ for automorphisms of Enriques surfaces over the complex numbers to
  odd characteristics. Then\, I will describe the unique counterexample in 
 characteristic 2. This is joint work with Giacomo Mezzedimi and Davide Ven
 iani. 
X-ALT-DESC:<p>Salem numbers appear naturally as dynamical degrees of isomet
 ries of hyperbolic lattices and hence in the study of entropy of surface a
 utomorphisms. The conjecturally smallest Salem number is Lehmer's number $
 \\lambda_{10}$\, which can be realized by automorphisms of K3 surfaces and
  rational surfaces by work of McMullen. In this talk\, I will explain how 
 to generalize a result of Oguiso asserting the non-realizability of $\\lam
 bda_{10}$ for automorphisms of Enriques surfaces over the complex numbers 
 to odd characteristics. Then\, I will describe the unique counterexample i
 n characteristic 2. This is joint work with Giacomo Mezzedimi and Davide V
 eniani.&nbsp\;</p>
DTEND;TZID=Europe/Zurich:20260120T120000
END:VEVENT
END:VCALENDAR