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arXiv math/0202133math.AGmath.AC
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亏格不超过8的Mukai簇与一般标准曲线的几何合数

Geometric Syzygies of Mukai Varieties and General Canonical Curves with Genus at most 8

Hans-Christian v. Bothmer

摘要:

本文描述了截面亏格6,7,8的Mukai簇的最小秩最后合型空间。在此基础上,我们显示:1。亏格为6的一般标准曲线的第一几何合点在P^4中形成一个非退化的5条线的构型。2.亏格为7的一般标准曲线的第一几何合点在P^15中的旋量簇S上形成一个非退化的、线性法向的、84次直纹曲面。3.亏格为8的一般标准曲线的第二几何合点在P^20中的2重嵌入P^5上形成14条二次曲线的非退化构型。这证明了格林猜想[1984]的一个自然推广,即在这些情况下,几何合点应该跨越所有合点的空间。本文将结果1和3推广到数学AG/0108078中偶数亏格的一般曲线。结果2是本文的主要新结果。

英文摘要:

We describe the spaces of minimal rank last syzygies for the Mukai Varieties of sectional genus 6,7 and 8. Based on this we show: 1. The first geometric syzygies of a general canonical curve of genus 6 form a non degenerate configuration of 5 lines in P^4. 2. The first geometric syzygies of a general canonical curve of genus 7 form a non degenerate, linearly normal, ruled surface of degree 84 on a spinor variety S in P^15. 3. The second geometric syzygies of a general canonical curve of genus 8 form a non degenerate configuration of 14 conics on a 2-uple embedded P^5 in P^20. This proves a natural generalization of Green's conjecture [1984], namely that the geometric syzygies should span the space of all syzygies, in these cases. We have generalized results 1 and 3 to general curves of even genus in math.AG/0108078. Result 2 is the main new result of this paper.

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