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- W2023648450 abstract "In this work, we introduce an algebraic operation between bounded Hessenberg matrices and we analyze some of its properties. We call this operation m-sum and we obtain an expression for it that involves the Cholesky factorization of the corresponding Hermitian positive definite matrices associated with the Hessenberg components. This work extends a method to obtain the Hessenberg matrix of the sum of measures from the Hessenberg matrices of the individual measures, introduced recently by the authors for subnormal matrices, to matrices which are not necessarily subnormal. Moreover, we give some examples and we obtain the explicit formula for the m-sum of a weighted shift. In particular, we construct an interesting example: a subnormal Hessenberg matrix obtained as the m-sum of two not subnormal Hessenberg matrices." @default.
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- W2023648450 date "2011-08-01" @default.
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- W2023648450 title "Hessenberg matrix for sums of Hermitian positive definite matrices and weighted shifts" @default.
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- W2023648450 doi "https://doi.org/10.1016/j.cam.2011.05.031" @default.
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