Titlebook: Abelian Groups and Representations of Finite Partially Ordered Sets; David M. Arnold Book 2000 Springer Science+Business Media New York 20

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,Spectral Analysis of a Dissipative Singular Schr?dinger Operator in Terms of a Functional Model,t is, the combination into one group of the sets of eigenvectors and root vectors corresponding to some neighbouring points of the spectrum, is defined non-uniquely and, to a large extent, non-constructively. Hence, as a rule, the assertions concerning bases with brackets have the character of existence theorems.

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