Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4607451 | Journal of Approximation Theory | 2011 | 32 Pages |
Abstract
We show that for many families of OPUC, one has ‖φn′‖2/n→1, a condition we call normal behavior. We prove that this implies |αn|→0|αn|→0 and that it holds if ∑n=0∞|αn|<∞. We also prove it is true for many sparse sequences. On the other hand, it is often destroyed by the insertion of a mass point.
Keywords
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Physical Sciences and Engineering
Mathematics
Analysis
Authors
Andrei Martínez-Finkelshtein, Barry Simon,