Projective normality of ruled surfaces

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In this article we study normal generation of irrational ruled surfaces. When C is a smooth curve of genus g, Green and Lazarsfeld proved that a very ample line bundle L ε PicX with deg(L) ≥ 2g+1-2h1(X,L)- Cliff(X) is normally generated where Cliff(C) denotes the Clifford index of the curve C (Green and Lazarsfeld, 1986). We generalize this to line bundles on a ruled surface over C.

Original languageEnglish
Pages (from-to)839-847
Number of pages9
JournalProceedings of the American Mathematical Society
Issue number3
Publication statusPublished - 2008 Mar

ASJC Scopus subject areas

  • General Mathematics
  • Applied Mathematics


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