Identyfikatory
Warianty tytułu
Języki publikacji
Abstrakty
For a block lower triangular contraction T, necessary and sufficient conditions are given in order that there exist block lower triangular contractions T1,1, T2,1 and T2,2 such that Ut= [ T1,1 T ] T2,1 T2,2 is unitary. For the case when T1,1* and T2,2 have dense ranges, all such embeddings are described. Each unitary embedding of UT induces a contractive realization of T, and various properties of this realization are characterized in terms of the unitary embedding.
Rocznik
Tom
Strony
1331--1360
Opis fizyczny
Bibliogr. 17 poz.
Twórcy
autor
- Division of Mathematics and Computer Sciences Faculty of Sciences, De Boelelaan 1081 a 1081 HV Amsterdam, The Netherlands, drpik@cs.vu.nl
Bibliografia
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BPZ1-0012-0063