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arXiv 1609.08265cs.ITmath.AGmath.IT
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Schubert码的最小距离和最小重量码字

Minimum Distance and the Minimum Weight Codewords of Schubert Codes

Sudhir R. Ghorpade, Prasant Singh

摘要:

我们认为线性码与Schubert品种在Grassmannian。这些码的最小距离的公式在2000年被证明,在各种特殊情况下被建立后,它在2008年被Xiang证明。我们给出了这个公式的另一种证明。通过引入Schubert可分解元的概念,给出了Schubert码的最小码重的一个刻画。它表明,对应于舒伯特可分解元素的码字是最小的重量,也是在许多情况下,反之亦然。给出了Schubert码的最小权码字个数的一个下界,在某些情况下,给出了一个精确的计算公式。从几何的角度来看,这些结果对应于确定可以位于Grassmannian中Schubert簇的超平面截面上的$\mathbb{F}_q$ -有理点的最大数量,其非退化嵌入Plücker射影空间的射影子空间中,以及达到最大值的超平面的数量。

英文摘要:

We consider linear codes associated to Schubert varieties in Grassmannians. A formula for the minimum distance of these codes was conjectured in 2000 and after having been established in various special cases, it was proved in 2008 by Xiang. We give an alternative proof of this formula. Further, we propose a characterization of the minimum weight codewords of Schubert codes by introducing the notion of Schubert decomposable elements of certain exterior powers. It is shown that codewords corresponding to Schubert decomposable elements are of minimum weight and also that the converse is true in many cases. A lower bound, and in some cases, an exact formula, for the number of minimum weight codewords of Schubert codes is also given. From a geometric point of view, these results correspond to determining the maximum number of $\mathbb{F}_q$-rational points that can lie on a hyperplane section of a Schubert variety in a Grassmannian with its nondegenerate embedding in a projective subspace of the Plücker projective space, and also the number of hyperplanes for which the maximum is attained.

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