Geodesic
Riesz completeness of the~eigenelements and associated elements of linear selfadjoint pencils
Sbornik. Mathematics, Tome 81 (1995) no. 2, pp. 343-361

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Methods of the theory of interpolation of Banach spaces are applied to the study of the following questions: Riesz completeness for linear pencils; selection of maximal semidefinite invariant subspaces for a given operator defined in a Krein space; boundedness of the Riesz projections corresponding to the unbounded component of the spectrum of a positive operator. 
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     author = {S. G. Pyatkov},
     title = {Riesz completeness of the~eigenelements and associated elements of linear selfadjoint pencils},
     journal = {Sbornik. Mathematics},
     pages = {343--361},
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     volume = {81},
     number = {2},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1995_81_2_a4/}
}
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S. G. Pyatkov. Riesz completeness of the~eigenelements and associated elements of linear selfadjoint pencils. Sbornik. Mathematics, Tome 81 (1995) no. 2, pp. 343-361. http://geodesic.mathdoc.fr/item/SM_1995_81_2_a4/