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arXiv 1901.03381math.AGmath.AC
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关于曲线和Frobenius分裂超曲面的行列式方程

On determinantal equations for curves and Frobenius split hypersurfaces

Kirti Joshi

AI总结:

本文研究了射影空间中曲线和超曲面的内在行列式方程存在性问题,证明了在多种正特征情况下平面射影曲线和Frobenius分裂超曲面均存在内在行列式或Pfaffian表示。

摘要:

我考虑了射影空间中平面射影曲线和超曲面的内在行列式方程的存在性问题,并证明在许多感兴趣的情况下存在内在行列式方程。特别地,我证明了:(1) 在特征2中,任何亏格至少为1的通常平面射影曲线由内在行列式方程给出;(2) 在特征3中,任何平面射影曲线都是内在Pfaffian的;(3) 在任何正特征中,任何平面射影曲线在集合论意义上是某个内在矩阵的行列式;(4) 在任何正特征中,${\f P}^n$中的任何Frobenius分裂超曲面在集合论意义上由一个具有1到$n-1$次齐次项的内在矩阵的行列式给出。特别地,这意味着任何光滑的Fano超曲面在集合论意义上由内在行列式方程给出,任何Frobenius分裂的Calabi-Yau超曲面也是如此。

英文摘要:

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 ${\bf P}^n$ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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