On vector-valued inequalities for Sidon sets and sets of interpolation

Details On vector-valued inequalities for Sidon sets and sets of interpolation On vector-valued inequalities for Sidon sets and sets of interpolation

1992-09-25

arxiv.org/abs/math/9209216v1

Mathematics

Functional Analysis

Scientific paper

Let $E$ be a Sidon subset of the integers and suppose $X$ is a Banach space. Then Pisier has shown that $E$-spectral polynomials with values in $X$ behave like Rademacher sums with respect to $L_p-$norms. We consider the situation when $X$ is a quasi-Banach space. For general quasi-Banach spaces we show that a similar result holds if and only if $E$ is a set of interpolation ($I_0$-set). However for certain special classes of quasi-Banach spaces we are able to prove such a result for larger sets. Thus if $X$ is restricted to be ``natural'' then the result holds for all Sidon sets. We also consider spaces with plurisubharmonic norms and introduce the class of analytic Sidon sets.

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