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Sampling sequences for Hardy spaces of the ball
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We show that a sequence a:= {ak}k in the unit ball of Cn is sampling for the Hardy spaces Hp, 0 < p < ∞ , if and only if the admissible accumulation set of a in the unit sphere has full measure. For p = ∞ the situation is quite different. While this condition is still sufficient, when n > 1 (in contrast to the one dimensional situation) there exist sampling sequences for H∞ whose admissible accumulation set has measure 0. We also consider the sequence a(ω ) obtained by applying to each ak a random rotation, and give a necessary and sufficient condition on {|ak|}k so that, with probability one, a(ω ) is of sampling for Hp, p < ∞ .
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MASSANEDA CLARES, Francesc Xavier and THOMAS, Pascal J. Sampling sequences for Hardy spaces of the ball. Proceedings of the American Mathematical Society. 2000. Vol. 128, num. 3, pags. 837-843. ISSN 1088-6826. [consulted: 20 of May of 2026]. Available at: https://hdl.handle.net/2445/7726