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arXiv 1606.02574math.AGmath.RA
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正规秩有界的矩阵束集合不可约分支的一个显式描述

An explicit description of the irreducible components of the set of matrix pencils with bounded normal rank

Fernando De Terán, Froilán M. Dopico, J. M. Landsberg

摘要:

正规秩至多为r的m × n奇异矩阵束的集合是具有r+1个不可约分量的代数集。这些分量是Kronecker标准形中r+1矩阵束的轨道(在严格等价下)的闭包。在本文中,我们提供了一个新的明确的描述,这些不可约的组件,这是一个参数化的每个组件。因此,我们可以在这些组件中的每一个中显式地构造任何铅笔。这些不可约分量的新描述由r秩-1矩阵束的总和组成,即,一个列多项式向量的次数至多为1次,一个行多项式向量的次数至多为1次,其中我们将这两个向量中的一个向量的次数设为零。具有零次的行向量的数目决定每个不可约分量。

英文摘要:

The set of mxn singular matrix pencils with normal rank at most r is an algebraic set with r+1 irreducible components. These components are the closure of the orbits (under strict equivalence) of r+1 matrix pencils which are in Kronecker canonical form. In this paper, we provide a new explicit description of each of these irreducible components which is a parametrization of each component. Therefore one can explicitly construct any pencil in each of these components. The new description of each of these irreducible components consists of the sum of r rank-1 matrix pencils, namely, a column polynomial vector of degree at most 1 times a row polynomial vector of degree at most 1, where we impose one of these two vectors to have degree zero. The number of row vectors with zero degree determines each irreducible component.

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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