TOTALLY MONOTONE-FUNCTIONS WITH APPLICATIONS TO THE BERGMAN SPACE

Citation
B. Korenblum et al., TOTALLY MONOTONE-FUNCTIONS WITH APPLICATIONS TO THE BERGMAN SPACE, Transactions of the American Mathematical Society, 337(2), 1993, pp. 795-806
Citations number
4
Categorie Soggetti
Mathematics, General",Mathematics
ISSN journal
00029947
Volume
337
Issue
2
Year of publication
1993
Pages
795 - 806
Database
ISI
SICI code
0002-9947(1993)337:2<795:TMWATT>2.0.ZU;2-#
Abstract
Using a theorem of S. Bernstein [1] we prove a special case of the fol lowing maximum principle for the Bergman space conjectured by B. Koren blum [3]: There exists a number delta is-an-element-of (0, 1) such tha t if f and g are analytic functions on the open unit disk D with \f(z) \ less-than-or-equal-to \g(z)\ on delta less-than-or-equal-to \z\ < 1 then \\f\\2 less-than-or-equal-to \\g\\2, where \\ \\2 is the L2 norm with respect to area measure on D. We prove the above conjecture when either f or g is a monomial; in this case we show that the optimal con stant delta is greater than or equal to 1/square-root 3.