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- W2057761680 abstract "This paper is concerned with the perturbation of a multiple eigenvalue μ of the Hermitian matrix A=diag(μI,A22) when it undergoes an off-diagonal perturbation E whose columns have widely varying magnitudes. When some of E’s columns are much smaller than the others, some copies of μ are much less sensitive than any existing bound suggests. We explain this phenomenon by establishing individual perturbation bounds for different copies of μ. They show that when A22-μI is definite the ith bound scales quadratically with the norm of the ith column, and in the indefinite case the bound is necessarily proportional to the product of E’s ith column norm and E’s norm. An extension to the generalized Hermitian eigenvalue problem is also presented." @default.
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- W2057761680 date "2012-07-01" @default.
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- W2057761680 title "Perturbation of multiple eigenvalues of Hermitian matrices" @default.
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- W2057761680 doi "https://doi.org/10.1016/j.laa.2012.01.035" @default.
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