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DTSTART:19810329T020000
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BEGIN:VEVENT
UID:news1988@dmi.unibas.ch
DTSTAMP;TZID=Europe/Zurich:20260306T132609
DTSTART;TZID=Europe/Zurich:20260310T103000
SUMMARY:Seminar Algebra and Geometry: Claudia Stadlmayr (Universität Neuch
 âtel)
DESCRIPTION:Group schemes provide a refined notion of symmetry in positive 
 characteristic: they detect infinitesimal structure invisible to the discr
 ete automorphism group. Classical examples such as mu_p or alpha_p equip t
 he trivial topological space with a non-trivial algebraic structure.In thi
 s talk I will explain how this perspective can be used to classify weak an
 d RDP del Pezzo surfaces admitting global vector fields\, and how phenomen
 a unique to small characteristic – such as non-lifting vector fields on 
 rational double point singularities (RDPs) – can be illuminated using th
 e group-scheme framework.If time permits\, I will outline applications and
  ongoing projects: towards higher-dimensional Fano varieties with infinite
  automorphism groups\, (equivariant) compactifications of the affine plane
 \, group scheme torsors and their smoothness behavior.
X-ALT-DESC:<p>Group schemes provide a refined notion of symmetry in positiv
 e characteristic: they detect infinitesimal structure invisible to the dis
 crete automorphism group. Classical examples such as mu_p or alpha_p equip
  the trivial topological space with a non-trivial algebraic structure.<br 
 />In this talk I will explain how this perspective can be used to classify
  weak and RDP del Pezzo surfaces admitting global vector fields\, and how 
 phenomena unique to small characteristic – such as non-lifting vector fi
 elds on rational double point singularities (RDPs) – can be illuminated 
 using the group-scheme framework.<br />If time permits\, I will outline ap
 plications and ongoing projects: towards higher-dimensional Fano varieties
  with infinite automorphism groups\, (equivariant) compactifications of th
 e affine plane\, group scheme torsors and their smoothness behavior.</p>
DTEND;TZID=Europe/Zurich:20260310T120000
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