On curves lying on a rational normal surface scroll

Wanseok Lee, Euisung Park

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1 Citation (Scopus)


In this paper, we study the minimal free resolution of non-ACM divisors X of a smooth rational normal surface scroll S=S(a 1 ,a 2 )⊂P r . Our main result shows that for a 2 ≥2a 1 −1, there exists a nice decomposition of the Betti table of X as a sum of much simpler Betti tables. As a by-product of our results, we obtain a complete description of the graded Betti numbers of X for the cases where S=S(1,r−2)for all r≥3 and S=S(2,r−3)for all r≥6.

Original languageEnglish
Pages (from-to)4458-4476
Number of pages19
JournalJournal of Pure and Applied Algebra
Issue number10
Publication statusPublished - 2019 Oct


  • Divisor
  • Minimal free resolution
  • Rational normal surface scroll

ASJC Scopus subject areas

  • Algebra and Number Theory


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