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Isospectrality and matrices with concentric circular higher rank numerical ranges
Linear Algebra and its Applications ( IF 1.1 ) Pub Date : 2021-09-01 , DOI: 10.1016/j.laa.2021.08.025 Edward Poon 1 , Hugo J. Woerdeman 2
中文翻译:
同心圆高阶数值范围等谱和矩阵
更新日期:2021-09-08
Linear Algebra and its Applications ( IF 1.1 ) Pub Date : 2021-09-01 , DOI: 10.1016/j.laa.2021.08.025 Edward Poon 1 , Hugo J. Woerdeman 2
Affiliation
We characterize under what conditions Hermitian matrices and have the property that the spectrum of is independent of t (thus, the trigonometric pencil is isospectral). One of the characterizations requires the first higher rank numerical ranges of the matrix to be circular disks with center 0. Finding the unitary similarity between and, say, involves finding a solution to Lax's equation.
中文翻译:
同心圆高阶数值范围等谱和矩阵
我们在什么条件下表征 厄米矩阵 和 具有频谱的性质 与t无关(因此,三角铅笔是等谱的)。其中一个特征需要第一个 矩阵的高阶数值范围 是中心为 0 的圆盘。 并且说, 涉及找到 Lax 方程的解。