3 citations · 3 across the 6 of their papers we have counts for
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Unitary boundary pairs for isometric operators in Pontryagin spaces and generalized coresolvents
D. Baidiuk, V. Derkach, S. Hassi
An isometric operator V in a Pontryagin space H is called standard, if its domain and the range are nondegenerate subspaces in H. A description of coresolvents for standard isometr…
Completion and extension of operators in Kre\uın spaces
D. Baidiuk
A generalization of the well-known results of M.G. Kre\uın about the description of selfadjoint contractive extension of a hermitian contraction is obtained. This generalization co…
Completion, extension, factorization, and lifting of operators with a negative index
D. Baidiuk, S. Hassi
The famous results of M.G. Kre\uın concerning the description of selfadjoint contractive extensions of a Hermitian contraction and the characterization of all nonnegative sel…
Abstract interpolation problem in generalized Schur classes
D. Baidiuk
An indefinite variant of the abstract interpolation problem is considered. Associated to this problem is a model Pontryagin space isometric operator V. All the solutions of the pro…