ON DETERMINANTAL EQUATIONS FOR CURVES AND FROBENIUS SPLIT HYPERSURFACES

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Abstract

I consider the problem of existence of intrinsic determinantal equations for plane projective curves and hypersurfaces in projective space and prove that in many cases of interest there exist intrinsic determinantal equations. In particular I prove (1) in characteristic two any ordinary, plane projective curve of genus at least one is given by an intrinsic determinantal equation (2) in characteristic three any plane projective curve is an intrinsic Pfaffian (3) in any positive characteristic any plane projective curve is set theoretically the determinant of an intrinsic matrix (4) in any positive characteristic, any Frobenius split hypersurface in Pn is given by set theoretically as the determinant of an intrinsic matrix with homogeneous entries of degree between 1 and n − 1. In particular this implies that any smooth, Fano hypersurface is set theoretically given by an intrinsic determinantal equation and the same is also true for any Frobenius split Calabi-Yau hypersurface.

MSC Codes 14J60, 14H60

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Jan 10 2019

Keywords

  • And phrases. determinantal equations
  • Calabi-yau varieties
  • Frobenius splitting
  • Ordinary curves

ASJC Scopus subject areas

  • General

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