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arXiv 1608.02530math.AGcs.CC
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单项式的边界秩

Border Ranks of Monomials

Luke Oeding

AI总结:

本文研究Young展平方法对单项式边界秩的下界极限,给出最优形状,覆盖次数≤6、3变量及变量乘积幂,并指出高次时无法匹配猜想紧上界。

摘要:

由Landsberg和Ottaviani引入的Young展平方法给出了割线簇的行列式方程,其非零性为张量特别是多项式的边界秩提供了下界。我们研究了Young展平的单项式最优形状,这些形状展示了Young展平方法的极限。特别地,它们为大量单项式类提供了可能的最佳下界,包括所有次数不超过6的单项式、3个变量中的单项式以及变量乘积的任意幂。另一方面,对于次数7及以上的单项式,存在这样的单项式,使得任何Young展平都无法给出与Landsberg和Teitler的猜想紧上界相匹配的下界。

英文摘要:

Young flattenings, introduced by Landsberg and Ottaviani, give determinantal equations for secant varieties and their non-vanishing provides lower bounds for border ranks of tensors and in particular polynomials. We study monomial-optimal shapes for Young flattenings, which exhibit the limits of the Young flattening method. In particular, they provide the best possible lower bound for large classes of monomials including all monomials up to degree 6, monomials in 3 variables, and any power of the product of variables. On the other hand, for degree 7 and higher there are monomials for which no Young flattening can give a lower bound that matches the conjecturally tight upper bound of Landsberg and Teitler.

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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