Geodesic
Construction of the functional model of B. S.–Nagy–C. Foias
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part VIII, Tome 73 (1977), pp. 16-23 Cet article a éte moissonné depuis la source Math-Net.Ru

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Methodological paper: quick and simple construction of the Nagy–Foias functional model, using only elementary information about Hilbert spaces and operators on them. A formula is derived for a characteristic function. The account is based on an idea of B. S. Pavlov (Izv. Akad. Nauk SSSR, Ser. Mat.,39, No. 1, 123–148 (1975)) on symmetrization of the notation for a model space. 
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     author = {V. I. Vasyunin},
     title = {Construction of the functional model of {B.~S.{\textendash}Nagy{\textendash}C.~Foias}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {16--23},
     year = {1977},
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}
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V. I. Vasyunin. Construction of the functional model of B. S.–Nagy–C. Foias. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part VIII, Tome 73 (1977), pp. 16-23. http://geodesic.mathdoc.fr/item/ZNSL_1977_73_a1/