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SUMMARY:Dessins d'enfants and modular curves associated to the sporadic gr
 oup Co3 and Janko 2
DTSTART:20191105T150000
DTEND:20191105T163000
DTSTAMP:20260506T195150Z
UID:beb9d433ae77bf7500d07b5ad4d27ab489f65c9ca3086f5c726dc72b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Hartmut Monien \, University of Bonn\nDessins d'enfants and th
 eir realization as Belyi maps of compact Riemann surfaces were originally 
 discovered by Felix Klein. Their importance and relevance was finally unde
 rstood by Alexander Grothendieck who rediscovered and named them in his "E
 squisse d'un programme" in 1984. The most important aspect of dessins is t
 he operation of the absolute Galois group on them. Accordingly\, dessins d
 'enfants provide fascinating insights and fundamental links between differ
 ent fields of mathematics like inverse Galois theory\, Teichmüller spaces
 \, hypermaps\, algebraic number theory and mathematical physics. The relat
 ed problem of the construction of Riemann surfaces with given automorphism
  group turns out to be rather challenging. In my talk I will discuss metho
 ds for constructing Belyi maps explicitly.\n \nDescription: (30 minute ge
 neral talk followed by expert talk)\n 
LOCATION:GR A3 30 https://plan.epfl.ch/?room==GR%20A3%2030
STATUS:CONFIRMED
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