Minimizing the Cayley transform of an orthogonal matrix by multiplying by signature matrices

Minimizing the Cayley transform of an orthogonal matrix by multiplying by signature matrices
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通过乘以签名矩阵来最小化正交矩阵的凯莱变换

DOI:
10.1016/j.laa.2014.01.032
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发表时间:
2014
影响因子:
1.1
通讯作者:
Evan M. O’Dorney
Evan M. O’Dorney
中科院分区:
数学3区
文献类型:
--
作者:
Evan M. O’Dorney

文献摘要

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凯莱变换$(A)=(I-A)(I+ A)-1,将反对称矩阵映射为正交矩阵,反之亦然。给定一个正交矩阵Q,我们可以选择一个对角矩阵D,每个对角元素为±1(签名矩阵),如果I+ Q D是非奇异的,则计算反对称矩阵$(Q D)。一个开放的问题是表明,通过适当的选择D,我们可以使$(Q D)的每个条目的绝对值小于或等于1。我们解决这个问题,表明主要的未成年人的$(Q D)是相关的主要未成年人的$(Q)以一种简单的方式。
Abstract The Cayley transform, $(A)=(I− A)(I+ A)− 1, maps skew-symmetric matrices to orthogonal matrices and vice versa. Given an orthogonal matrix Q, we can choose a diagonal matrix D with each diagonal entry±1 (a signature matrix) and, if I+ Q D is nonsingular, calculate the skew-symmetric matrix $(Q D). An open problem is to show that, by a suitable choice of D, we can make every entry of $(Q D) less than or equal to 1 in absolute value. We solve this problem by showing that the principal minors of $(Q D) are related in a simple way to the principal minors of $(Q).