Two-Parameter SVD: Coalescing Singular Values and Periodicity
Two-Parameter SVD: Coalescing Singular Values and Periodicity
复制标题
双参数 SVD:合并奇异值和周期性
DOI:
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发表时间:
2009
影响因子:
1.5
通讯作者:
A. Pugliese
中科院分区:
文献类型:
--
作者:
L. Dieci;A. Pugliese
We consider matrix valued functions of two parameters in a simply connected region $Omega$. We propose a new criterion to detect when such functions have coalescing singular values. For generic coalescings, the singular values come together in a “double cone”-like intersection. We relate the existence of any such singularity to the periodic structure of the orthogonal factors in the singular value decomposition of the one-parameter matrix function obtained restricting to closed loops in $Omega$. Our theoretical result is very amenable to approximate numerically the location of the singularities.