BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Lancaster University Faculty of Science and Technology//NONSGML v1.0//EN
BEGIN:VTIMEZONE
TZID:/Europe/London
X-LIC-LOCATION:Europe/London
BEGIN:DAYLIGHT
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
TZNAME:BST
DTSTART:19700329T010000
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=3
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
TZNAME:GMT
DTSTART:19701025T020000
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=10
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
UID:1212
SUMMARY:Pure Mathematics Seminar: James Cruickshank
DESCRIPTION:Henneberg operations on three dimensional bar and joint frameworks\n\nBar and joint frameworks are a mathematical abstraction of structures made from rigid bars that are joined together with universal joints. A fundamental problem in this theory is to give necessary and sufficient conditions for such a framework to be rigid. \n\nFor frameworks in the plane this problem was solved by Laman in 1970 - at least for suitably generic frameworks. On the other hand the corresponding three dimensional problem remains, somewhat surprisingly perhaps, open. \n\nA sticking point seems to be our lack of understanding of Henneberg operations in three dimensions - these are certain graph theoretic constructions that arise naturally in this context. In the talk we will survey the mathematical background to this problem, and describe some recent work which sheds some new light on the problem with Henneberg operations.
DTSTART:20131030T150000
DTEND:20131030T160000
LOCATION:A54, Postgraduate Statistics Centre Lecture Theatre
END:VEVENT
END:VCALENDAR