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- W1597152035 abstract "In the first section we provide a solution to the M. G. Krein problem about an inner description of the space $L_2(Sigma,H).$ In the second section we introduce the multiplicity function for an operator measure. Making use of the description of the space $L_2(Sigma,H)$ we establish the correctness of the definition and give a criterion for a spectral measure to be a dilation of a given operator measure. In the third section we prove that the set of principal vectors of an operator measure is an everywhere dense $G_delta.$ This implies, in particular, that there are a lot of principal vectors in any cyclic subspace of a selfadjoint operator. In the 4th section we introduce Hellinger spectral types for an arbitrary operator measure and prove the existence of subspaces, realizing them. In the 5-th section we give an answer to an old question of Paulsen and provide an analytic description of completely bounded operator measures. The results of this section belong to the second author." @default.
- W1597152035 created "2016-06-24" @default.
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- W1597152035 date "2002-06-21" @default.
- W1597152035 modified "2023-09-28" @default.
- W1597152035 title "On the spectral Theory of Operator Measures" @default.
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