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SUMMARY:Ronan Terpereau (Bourgogne)
DTSTART:20200917T090000Z
DTEND:20200917T100000Z
DTSTAMP:20260423T005800Z
UID:notts_ag/25
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/notts_ag/25/
 ">Actions of connected algebraic groups on rational 3-dimensional Mori fib
 rations</a>\nby Ronan Terpereau (Bourgogne) as part of Online Nottingham a
 lgebraic geometry seminar\n\n\nAbstract\nIn this talk we will study the co
 nnected algebraic groups acting on Mori fibrations $X \\to Y$ with $X$ a r
 ational threefold and $Y$ a curve or a surface. We will see how these grou
 ps can be classified\, using the minimal model program (MMP) and the Sarki
 sov program\, and how our results make possible to recover most of the cla
 ssification of the connected algebraic subgroups of the Cremona group $\\m
 athrm{Bir}(\\mathbb{P}^3)$ obtained by Hiroshi Umemura in the 1980's  when
  the base field is the field of complex numbers.\n
LOCATION:https://researchseminars.org/talk/notts_ag/25/
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