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  • Title
    An improvement of de Jong-Oort’s purity theorem
  • Author
    Yang, Yanhong
  • Is part of
    Münster Journal of Mathematics, Issue Münster Journal of Mathematics, page 129-140
  • Published
    2011
  • Language
    English
  • Document type
    Journal Article
  • URN
    urn:nbn:de:hbz:6-32449561241 
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Abstract
  • Consider an F-crystal over a noetherian scheme S. De Jong-Oort’s purity theorem states that the associated Newton polygons over all points of S are constant if this is true outside a subset of codimension bigger than 1. In this paper we show an improvement of the theorem, which says that the Newton polygons over all points of S have a common break point if this is true outside a subset of codimension bigger than 1.
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