Strauss V. On models of function type for a special class of normal operators in Krein spaces and their polar representation / V. Strauss // Methods of Functional Analysis and Topology. - 2007. - 13, № 1. - С. 67-82. - Бібліогр.: 20 назв. - англ.
The paper is devoted to a function model representation of a normal operator N acting in a Krein space. We assume that N and its adjoint operator <$E N sup symbol > have a common invariant subspace <$E L sub +> which is a maximal nonnegative subspace and has a representation as a sum of a finite-dimensional neutral subspace and a uniformly positive subspace. For N we construct a model representation as the multiplication operator by a scalar function acting in a suitable function space. This representation is applied to the problem of existence of a polar representation for normal operators of <$E D sub kappa sup +>-class.
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