Mean Convergence of Vector--valued Walsh Series

Details Mean Convergence of Vector--valued Walsh Series Mean Convergence of Vector--valued Walsh Series

1992-10-30

arxiv.org/abs/math/9210208v1

Mathematics

Functional Analysis

Scientific paper

Given any Banach space $X$, let $L_2^X$ denote the Banach space of all measurable functions $f:[0,1]\to X$ for which ||f||_2:=(int_0^1 ||f(t)||^2 dt)^{1/2} is finite. We show that $X$ is a UMD--space (see \cite{BUR:1986}) if and only if \lim_n||f-S_n(f)||_2=0 for all $f\in L_2^X$, where S_n(f):=sum_{i=0}^{n-1} (f,w_i)w_i is the $n$--th partial sum associated with the Walsh system $(w_i)$.

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