Towards a “matrix theory” for unbounded operator matrices
✍ Scribed by Rainer Nagel
- Publisher
- Springer-Verlag
- Year
- 1989
- Tongue
- French
- Weight
- 618 KB
- Volume
- 201
- Category
- Article
- ISSN
- 0025-5874
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📜 SIMILAR VOLUMES
Let G be a group, let U(G) denote the set of unbounded operators on L 2 (G) which are affiliated to the group von Neumann algebra W(G) of G, and let D(G) denote the division closure of CG in U(G). Thus D(G) is the smallest subring of U(G) containing CG which is closed under taking inverses. If G is
## Abstract We study spectral properties of 2 × 2 block operator matrices whose entries are unbounded operators between Banach spaces and with domains consisting of vectors satisfying certain relations between their components. We investigate closability in the product space, essential spectra and