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arXiv 1111.7005math.AG
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关于第三割线簇

On the third secant variety

Jarosław Buczyński, J. M. Landsberg

摘要:

我们确定边界秩最多为三的张量的正规形和秩。我们提出了一个微分几何分析的限制割线平面在更一般的情况下。特别是有最多四种类型的点上的限制三割线平面的cominuscule品种,如Grassmannians。我们还证明了所有三重Segre积的前两个割线簇的奇异轨迹至少有余维2。

英文摘要:

We determine normal forms and ranks of tensors of border rank at most three. We present a differential-geometric analysis of limits of secant planes in a more general context. In particular there are at most four types of points on limiting trisecant planes for cominuscule varieties such as Grassmannians. We also show the singular locus of the first two secant varieties of all triple Segre products has codimension at least two.

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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