BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Geometric morphisms between relizability toposes - Peter Johnstone
 \, DPMMS\, Cambridge
DTSTART:20121023T131500Z
DTEND:20121023T141500Z
UID:TALK40751@talks.cam.ac.uk
CONTACT:Julia Goedecke
DESCRIPTION:In his thesis (1994)\, John Longley gave an elegant characteri
 zation of those geometric morphisms between realizability toposes which sa
 tisfy a certain Beck--Chevalley condition. In this seminar\, I shall brief
 ly recall Longley's characterization\, and then give the\nrecently-discove
 red proof that the Beck--Chevalley condition is always satisfied. 
LOCATION:MR5\, Centre for Mathematical Sciences
END:VEVENT
END:VCALENDAR