Essential spherical isometries
A theorem of Fillmore, Stampfli and Williams asserts that a bounded linear Hilbert space operator is an essential isometry if and only if it is a compact perturbation of either an isometry or a coisometry with finite-dimensional kernel. In this note, we discuss the spherical analog of this result. I...
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| Dokumentumtípus: | Cikk |
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2019
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| Sorozat: | Acta scientiarum mathematicarum
85 No. 3-4 |
| Kulcsszavak: | Hilbert-tér, Fillmore, Stampfli és Williams tétel, izometria |
| doi: | 10.14232/actasm-018-335-6 |
| Online Access: | http://acta.bibl.u-szeged.hu/66334 |