Abstract
When is the composition of paraproducts bounded? This is an important, and difficult question. We consider randomized variants of this question, finding nonclassical characterizations. For dyadic interval I, let h I = h 0 I be the L 2-normalized Haar function adapted to I, the superscript 0 denoting that it has integral zero. Set h 1 I = |h I |, the superscript 1 denoting a nonzero integral. A (classical dyadic) paraproduct with symbol b is one of the operators
. Here, ɛ, δ ∈ {0, 1}, with one of the two being zero and the other one. We characterize when certain randomized compositions B(b, B(β, ·)) are bounded operators on L 2(ℝ), permitting in particular both paraproducts to be unbounded.
qRезюме
При каких условиях композиция пара-произведений ограничена? Это важная и трудная задача. Мы изучаем рандомизированные варианты этой задачи, и устанавливаем неклассические характеризации. Для двоичного интервала I, пусть h I = h 0 I обозначает нормированную в L 2 функцию Хаара с носителем I, причем верхний индекс 0 употреблен чтобы подчеркнуть, что среднее значение зтой функции по определению нулевое. Положим h 1 I = |h I |, где верхний индекс 1 в зтот раз подчеркивает ненулевое среднее. Классическое (двоичное) nара-nроuзведенuе с сuмволом ь — зто один из операторов вида
. Здесь ɛ, δ ∈ {0, 1}, причем если одно из зтих двух чисел равно 0, то другое равно 1. В зтой работе мы находим условия, при которых рандомизированные композиции \( \mathbb{B} \)(b, \( \mathbb{B} \)(β, ·)) являются ограниченными операторами на L 2(ℝ), хотя каждое из пара-произведений в отдельности не обязано быть ограниченным.
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Research supported in part by a National Science Foundation DMS Grant #0801036 (1); by a National Science Foundation Grant (2); by a National Science Foundation DMS Grants #0456976 and # 0801154 (3); by a National Science Foundation DMS Grant # 0752703 and the Fields Institute (4).
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Bilyk, D., Lacey, M.T., Li, X. et al. Composition of Haar paraproducts: the random case. Anal Math 35, 1–13 (2009). https://doi.org/10.1007/s10476-009-0101-9
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DOI: https://doi.org/10.1007/s10476-009-0101-9