On Commutant Lifting with Finite Defect,
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Rodrigo Arocena; Tomas Ya. Azizov; Aad Dijksma; Stefania A.M. Marcantognini
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Article
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1997
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Elsevier Science
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English
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## dedicated to heinz langer on the occasion of his 60th birthday In the lifting theorem of B. Sz.-Nagy, C. FoiasΓ , and D. Sarason the intertwining operator A, the operator that is lifted, is a contraction from one Hilbert space to another. J. A. Ball and J. W. Helton showed that a kind of liftin