Evento
Descrizione:
Abstract:
Over a field of characteristic zero, the Burnside group
is the free abelian group on isomorphism types of finitely
generated fields, graded by transcendence degree (with the
zeroth graded piece giving the usual Burnside group of the
absolute Galois group). I will describe the Burnside group,
including a remarkable specialization property of Kontsevich
and Tschinkel and an equivariant version introduced by
Kontsevich, Pestun and Tschinkel. A version for algebraic orbifolds,
developed jointly with Tschinkel, will also be presented.