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UID:news1965@dmi.unibas.ch
DTSTAMP;TZID=Europe/Zurich:20251206T161101
DTSTART;TZID=Europe/Zurich:20251209T103000
SUMMARY:Seminar Algebra and Geometry: Claudia Stadlmayr (Neuchâtel)
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 and (equivariant) compactifications of the affine pla
 ne.
X-ALT-DESC:<p><strong>Group schemes provide a refined notion of symmetry in
  positive characteristic: they detect infinitesimal structure invisible to
  the discrete automorphism group. Classical examples such as mu_p or alpha
 _p equip the trivial topological space with a non-trivial algebraic struct
 ure.</strong><br /><strong>In this talk I will explain how this perspectiv
 e 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 fields on rational double point singularities (RDPs
 ) – can be illuminated using the group-scheme framework.</strong><br /><
 strong>If time permits\, I will outline applications and ongoing projects:
  towards higher-dimensional Fano varieties with infinite automorphism grou
 ps and (equivariant) compactifications of the affine plane.</strong></p>
DTEND;TZID=Europe/Zurich:20251209T120000
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