Abstract
Let T be a contraction acting in a separable Hilbert space H and leaving invariant a nest N of subspaces of H. We answer the question: when does T have an isometric extension to H ⊕ H which leaves invariant the nest N ⊕ N = {N ⊕ N : N ⊕ N}.
Original language | English |
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Pages (from-to) | 346-352 |
Number of pages | 7 |
Journal | Integral Equations and Operator Theory |
Volume | 26 |
Issue number | 3 |
DOIs | |
State | Published - 1 Jan 1996 |
ASJC Scopus subject areas
- Analysis
- Algebra and Number Theory