BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//talks.cam.ac.uk//v3//EN
BEGIN:VTIMEZONE
TZID:Europe/London
BEGIN:DAYLIGHT
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
TZNAME:BST
DTSTART:19700329T010000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
TZNAME:GMT
DTSTART:19701025T020000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CATEGORIES:Differential Geometry and Topology Seminar
SUMMARY:Smoothing finite group actions on three-manifolds
- John Pardon\, Princeton
DTSTART;TZID=Europe/London:20190306T160000
DTEND;TZID=Europe/London:20190306T170000
UID:TALK115369AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/115369
DESCRIPTION:There exist continuous finite group actions on thr
ee-manifolds which are not smoothable\, in the sen
se that they are not smooth with respect to any sm
ooth structure. For example\, Bing constructed an
involution of the three-sphere whose fixed set is
a wildly embedded two-sphere. However\, one can
still ask whether every continuous finite group ac
tion on a three-manifold can be uniformly approxim
ated by a smooth action. We discuss an affirmativ
e solution to this question\, based on the author'
s work on the Hilbert--Smith conjecture in dimensi
on three.
LOCATION:MR13
CONTACT:Ivan Smith
END:VEVENT
END:VCALENDAR