Some results on the polynomial numerical hulls of matrices
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Abstract:
In this note we characterize polynomial numerical hulls of matrices $A in M_n$ such that$A^2$ is Hermitian. Also, we consider normal matrices $A in M_n$ whose $k^{th}$ power are semidefinite. For such matriceswe show that $V^k(A)=sigma(A)$.
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Journal title
volume 39 issue 3
pages 569- 578
publication date 2013-07-01
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