Norm and Numerical Peak Holomorphic Functions on Banach Spaces

Details Norm and Numerical Peak Holomorphic Functions on Banach Spaces Norm and Numerical Peak Holomorphic Functions on Banach Spaces

2007-06-05

arxiv.org/abs/0706.0574v1

Mathematics

Functional Analysis

Scientific paper

We introduce the notion of numerical (strong) peak function and investigate the denseness of the norm and numerical peak functions on complex Banach spaces. Let $A_b(B_X:X)$ be the Banach space of all bounded continuous functions $f$ on the unit ball $B_X$ of a Banach space $X$ and their restrictions $f|_{B_X^\circ}$ to the open unit ball are holomorphic. In finite dimensional spaces, we show that the intersection of the set of all norm peak functions and the set of all numerical peak functions is a dense $G_\delta$ subset of $A_b(B_X:X)$. We also prove that if $X$ is a smooth Banach space with the Radon-Nikod\'ym property, then the set of all numerical strong peak functions is dense in $A_b(B_X:X)$. In particular, when $X=L_p(\mu)$ $(1

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