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Preliminaries

  • François R. Cossec
  • Igor V. Dolgachev
Part of the Progress in Mathematics book series (PM, volume 76)

Abstract

A morphism f: X → Y of integral schemes over an algebraically closed field K is called a double cover if f is finite and of degree 2. A double cover is said to be separable (resp. inseparable) if the corresponding extension of the fields of rational functions is separable (resp. inseparable).

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Copyright information

© Birkhäuser Boston 1989

Authors and Affiliations

  • François R. Cossec
    • 1
  • Igor V. Dolgachev
    • 2
  1. 1.MATRASaint-Quentin-en-YvenFrance
  2. 2.Department of MathematicsUniversity of MichiganAnn ArborUSA

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