Titlebook: Recent Progress in Operator Theory; International Worksh I. Gohberg,R. Mennicken,C. Tretter Conference proceedings 1998 Springer Basel AG 1

宣傳

On generalized interpolation and shift invariant maximal semidefinite subspaces,d by Ball and Helton. Using a generalization of a theorem of I.S. Iokhvidov on the existence of invariant maximal semi-definite subspaces, the meromorphic case of the generalized interpolation problem is solved, and it is shown that this contains the bitangential Nevanlinna-Pick problem with poles.

infinite

synovial-joint

On the geometric structure of regular dilations,inski [.]). An intermediate situation is that where the .-tuple of contractions has a regular (or *-regular) isometric dilation. It is our aim to obtain structure results for Hilbert space multicontractions having this property. For simplicity we shall work in the case . = 2.

characteristic

Conference proceedings 1998d at the University of Regensburg, Germany, July 31 to August 4, 1995. It was the eigth workshop of this kind. Following is a list of the seven previous workshops with reference to their proceedings: 1981 Operator Theory (Santa Monica, California, USA) 1983 Applications of Linear Operator Theory to

不真

Inversion Formulas for Compressions of block-Toeplitz Operators,Inversion formulas are obtained for invertible compressions .(.) = . in...... of block-Toeplitz operators to a left shift invariant subspace .. = 1-1 of the Hardy space 1-2 of vector functions. These results are compared with known inversion formulas for block-Toeplitz matrices, block-Pick matrices and for Toeplitz integral operators in 1-3 (0,.).

先鋒派

On a new algorithm for almost periodic factorization,An algorithm is proposed allowing to find necessary and sufficient conditions for existence of an almost periodic factorization for several new classes of triangular and block triangular matrix functions.

冰河期

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