Theorem of the Base

Raymond Cheng, Lena Ji, Matt Larson, Noah Olander

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

We explain a proof of the Theorem of the Base: the Neron– Severi group of a proper variety is a finitely generated abelian group. We discuss, quite generally, the Picard functor and its torsion and identity components. We study representability and finiteness properties of the Picard functor, both absolutely and in families. Along the way, we streamline the original proof by using alterations, and we discuss some examples of peculiar Picard schemes.
Original languageEnglish (US)
Title of host publicationStacks Project Expository Collection
EditorsPieter Belmans, Wei Ho, Aise Johan de Jong
PublisherCambridge University Press
Pages163-193
Number of pages31
ISBN (Electronic)9781009051897
ISBN (Print)9781009054850
DOIs
StatePublished - 2022
Externally publishedYes

Publication series

NameLondon Mathematical Society Lecture Note Series

Keywords

  • Néron-Severi groups
  • Picard schemes
  • representability

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