Abstract
We completely characterize the spectrum of a weighted composition operator W Ψ,ℓ on H2(D) when ℓ has Denjoy-Wolff point a with 0 < |ℓ'′(α)| < 1, the iterates, ℓn, converge uniformly to a, and is in H∞ (the space of bounded analytic functions on D) and continuous at a. We also give bounds and some computations when |α| = 1 and ℓ'′(α) = 1 and, in addition, show that these symbols include all linear fractional ℓ that are hyperbolic and parabolic nonautomorphisms. Finally, we use these results to eliminate possible weights Ψ so that W Ψ,ℓ is seminormal.
| Original language | English |
|---|---|
| Pages (from-to) | 221-234 |
| Number of pages | 14 |
| Journal | Acta Scientiarum Mathematicarum |
| Volume | 82 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - 2016 |
Keywords
- Hyponormal operator
- Spectrum of an operator
- Weighted composition operator
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