In the lifting theorem of B. Sz.-Nagy, C. Foiaş, 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 lifting theorem still holds if the negative spectral subspace of the operator I-A*A is finite dimensional. In this paper we prove that this result remains valid if the Hilbert spaces are replaced by spaces with an indefinite metric.
To the memory of Mark Grigor’evic ̌ Krĕın Abstract notions of Julia and defect operators are used a...
In this paper a new lifting interpolation problem is introduced and an explicit solution is given. T...
AbstractLet T1ϵB(A), T2ϵB(B), and AϵB(A,B) be Kreĭn space bicontractions satisfying AT1 = T2A. Minim...
In the lifting theorem of B. Sz.-Nagy, C. Foias, and D. Sarason the intertwining operator A, the ope...
AbstractIn the lifting theorem of B. Sz.-Nagy, C. Foiaş, and D. Sarason the intertwining operatorA, ...
dedicated to heinz langer on the occasion of his 60th birthday In the lifting theorem of B. Sz.-Nagy...
We identify how the standard commuting dilation of the maximal commuting piece of any row contractio...
A proof of the commutant lifting theorem for contractions on Krein spaces is given. This is done by ...
The $n$-tuples of commuting Hilbert space contractions are considered. We give a model of a commutin...
AbstractThis paper deals with a problem of lifting of operators in Krein spaces, with minimal signat...
A proof of the commutant lifting theorem for contractions on Krein spaces is given. This is done by ...
AbstractWe characterise the pairs of commuting operators on Hilbert space for which the domainΓ={(λ1...
We develop a Sz.-Nagy--Foias-type functional model for a commutative contractive operator tuple $\un...
AbstractIt is shown that the infimum over all choices of the operator X of the norm of the operator ...
This paper deals with an operator theory of compressed shifts on the Hardy space over the bidisk. We...
To the memory of Mark Grigor’evic ̌ Krĕın Abstract notions of Julia and defect operators are used a...
In this paper a new lifting interpolation problem is introduced and an explicit solution is given. T...
AbstractLet T1ϵB(A), T2ϵB(B), and AϵB(A,B) be Kreĭn space bicontractions satisfying AT1 = T2A. Minim...
In the lifting theorem of B. Sz.-Nagy, C. Foias, and D. Sarason the intertwining operator A, the ope...
AbstractIn the lifting theorem of B. Sz.-Nagy, C. Foiaş, and D. Sarason the intertwining operatorA, ...
dedicated to heinz langer on the occasion of his 60th birthday In the lifting theorem of B. Sz.-Nagy...
We identify how the standard commuting dilation of the maximal commuting piece of any row contractio...
A proof of the commutant lifting theorem for contractions on Krein spaces is given. This is done by ...
The $n$-tuples of commuting Hilbert space contractions are considered. We give a model of a commutin...
AbstractThis paper deals with a problem of lifting of operators in Krein spaces, with minimal signat...
A proof of the commutant lifting theorem for contractions on Krein spaces is given. This is done by ...
AbstractWe characterise the pairs of commuting operators on Hilbert space for which the domainΓ={(λ1...
We develop a Sz.-Nagy--Foias-type functional model for a commutative contractive operator tuple $\un...
AbstractIt is shown that the infimum over all choices of the operator X of the norm of the operator ...
This paper deals with an operator theory of compressed shifts on the Hardy space over the bidisk. We...
To the memory of Mark Grigor’evic ̌ Krĕın Abstract notions of Julia and defect operators are used a...
In this paper a new lifting interpolation problem is introduced and an explicit solution is given. T...
AbstractLet T1ϵB(A), T2ϵB(B), and AϵB(A,B) be Kreĭn space bicontractions satisfying AT1 = T2A. Minim...