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By A. Povzner, V.N. Bogaevski. 1 Matrix Perturbation Theory. - 1.1 Perturbation Theory for a Linear Operator. - 1.2 Main Formulas. - 1.3 Diagonal Leading Operator. - 1.4 General Case. The Normal Form of the Matrix of the Operator M.- 1.5 Nilpotent Leading Operator.
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