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Mat. Sb., 1997 Volume 188, Number 8, Pages 149–157 (Mi sm250)

Widths of the unit ball in $H^\infty$ in weighted spaces $L_q(\mu)$

O. G. Parfenov

Pskov State Pedagogical College

Abstract: The study of the widths of the unit ball in the Hardy space $H^\infty$ in weighted spaces $L_q(\mu)$ is carried out. Sharp lower estimates of these widths in terms of the capacity of the support of the measure $\mu$ are obtained. The precise values of the widths are calculated for Blaschke lemniscates. For the measures $d\mu =p\,dS$, where $dS$ is plane Lebesgue measure and $p$ is a positive continuous weight, an asymptotic formula is found.

UDC: 517.51

MSC: Primary 46E20, 41A46; Secondary 30D50

Received: 16.04.1996

DOI: 10.4213/sm250


 English version:
Sbornik: Mathematics, 1997, 188:8, 1259–1267

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